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staging: comedi: refactor sysfs files in comedi_fops.c
Refactor the sysfs attributes and functions to remove the need for the forward declarations and use the DEVICE_ATTR macro to define them. Instead of individually creating sysfs device attribute files, wrap them in an attribute_group and use the sysfs_create_group function to create them. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Cc: Mori Hess <fmhess@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten
Greg Kroah-Hartman
parent
54fe68a8d7
commit
a5011a2615
@ -129,15 +129,295 @@ static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
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static int comedi_fasync(int fd, struct file *file, int on);
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static int is_device_busy(struct comedi_device *dev);
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static int resize_async_buffer(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_async *async, unsigned new_size);
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struct comedi_async *async, unsigned new_size)
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{
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int retval;
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/* declarations for sysfs attribute files */
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static struct device_attribute dev_attr_max_read_buffer_kb;
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static struct device_attribute dev_attr_read_buffer_kb;
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static struct device_attribute dev_attr_max_write_buffer_kb;
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static struct device_attribute dev_attr_write_buffer_kb;
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if (new_size > async->max_bufsize)
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return -EPERM;
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if (s->busy) {
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DPRINTK("subdevice is busy, cannot resize buffer\n");
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return -EBUSY;
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}
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if (async->mmap_count) {
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DPRINTK("subdevice is mmapped, cannot resize buffer\n");
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return -EBUSY;
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}
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if (!async->prealloc_buf)
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return -EINVAL;
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/* make sure buffer is an integral number of pages
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* (we round up) */
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new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
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retval = comedi_buf_alloc(dev, s, new_size);
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if (retval < 0)
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return retval;
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if (s->buf_change) {
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retval = s->buf_change(dev, s, new_size);
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if (retval < 0)
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return retval;
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}
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DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
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dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
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return 0;
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}
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/* sysfs attribute files */
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static const unsigned bytes_per_kibi = 1024;
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static ssize_t show_max_read_buffer_kb(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t retval;
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned max_buffer_size_kb = 0;
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struct comedi_subdevice *const read_subdevice =
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comedi_get_read_subdevice(info);
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mutex_lock(&info->device->mutex);
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if (read_subdevice &&
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(read_subdevice->subdev_flags & SDF_CMD_READ) &&
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read_subdevice->async) {
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max_buffer_size_kb = read_subdevice->async->max_bufsize /
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bytes_per_kibi;
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}
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retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
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mutex_unlock(&info->device->mutex);
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return retval;
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}
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static ssize_t store_max_read_buffer_kb(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned int new_max_size_kb;
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unsigned int new_max_size;
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int ret;
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struct comedi_subdevice *const read_subdevice =
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comedi_get_read_subdevice(info);
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ret = kstrtouint(buf, 10, &new_max_size_kb);
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if (ret)
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return ret;
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if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
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return -EINVAL;
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new_max_size = new_max_size_kb * bytes_per_kibi;
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mutex_lock(&info->device->mutex);
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if (read_subdevice == NULL ||
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(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
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read_subdevice->async == NULL) {
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mutex_unlock(&info->device->mutex);
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return -EINVAL;
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}
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read_subdevice->async->max_bufsize = new_max_size;
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mutex_unlock(&info->device->mutex);
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return count;
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}
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static DEVICE_ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
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show_max_read_buffer_kb, store_max_read_buffer_kb);
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static ssize_t show_read_buffer_kb(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t retval;
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned buffer_size_kb = 0;
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struct comedi_subdevice *const read_subdevice =
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comedi_get_read_subdevice(info);
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mutex_lock(&info->device->mutex);
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if (read_subdevice &&
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(read_subdevice->subdev_flags & SDF_CMD_READ) &&
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read_subdevice->async) {
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buffer_size_kb = read_subdevice->async->prealloc_bufsz /
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bytes_per_kibi;
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}
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retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
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mutex_unlock(&info->device->mutex);
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return retval;
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}
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static ssize_t store_read_buffer_kb(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned int new_size_kb;
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unsigned int new_size;
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int retval;
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int ret;
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struct comedi_subdevice *const read_subdevice =
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comedi_get_read_subdevice(info);
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ret = kstrtouint(buf, 10, &new_size_kb);
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if (ret)
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return ret;
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if (new_size_kb > (UINT_MAX / bytes_per_kibi))
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return -EINVAL;
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new_size = new_size_kb * bytes_per_kibi;
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mutex_lock(&info->device->mutex);
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if (read_subdevice == NULL ||
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(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
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read_subdevice->async == NULL) {
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mutex_unlock(&info->device->mutex);
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return -EINVAL;
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}
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retval = resize_async_buffer(info->device, read_subdevice,
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read_subdevice->async, new_size);
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mutex_unlock(&info->device->mutex);
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if (retval < 0)
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return retval;
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return count;
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}
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static DEVICE_ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
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show_read_buffer_kb, store_read_buffer_kb);
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static ssize_t show_max_write_buffer_kb(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t retval;
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned max_buffer_size_kb = 0;
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struct comedi_subdevice *const write_subdevice =
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comedi_get_write_subdevice(info);
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mutex_lock(&info->device->mutex);
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if (write_subdevice &&
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(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
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write_subdevice->async) {
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max_buffer_size_kb = write_subdevice->async->max_bufsize /
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bytes_per_kibi;
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}
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retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
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mutex_unlock(&info->device->mutex);
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return retval;
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}
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static ssize_t store_max_write_buffer_kb(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned int new_max_size_kb;
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unsigned int new_max_size;
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int ret;
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struct comedi_subdevice *const write_subdevice =
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comedi_get_write_subdevice(info);
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ret = kstrtouint(buf, 10, &new_max_size_kb);
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if (ret)
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return ret;
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if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
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return -EINVAL;
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new_max_size = new_max_size_kb * bytes_per_kibi;
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mutex_lock(&info->device->mutex);
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if (write_subdevice == NULL ||
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(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
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write_subdevice->async == NULL) {
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mutex_unlock(&info->device->mutex);
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return -EINVAL;
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}
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write_subdevice->async->max_bufsize = new_max_size;
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mutex_unlock(&info->device->mutex);
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return count;
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}
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static DEVICE_ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
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show_max_write_buffer_kb, store_max_write_buffer_kb);
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static ssize_t show_write_buffer_kb(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t retval;
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned buffer_size_kb = 0;
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struct comedi_subdevice *const write_subdevice =
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comedi_get_write_subdevice(info);
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mutex_lock(&info->device->mutex);
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if (write_subdevice &&
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(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
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write_subdevice->async) {
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buffer_size_kb = write_subdevice->async->prealloc_bufsz /
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bytes_per_kibi;
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}
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retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
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mutex_unlock(&info->device->mutex);
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return retval;
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}
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static ssize_t store_write_buffer_kb(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
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unsigned int new_size_kb;
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unsigned int new_size;
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int retval;
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int ret;
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struct comedi_subdevice *const write_subdevice =
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comedi_get_write_subdevice(info);
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ret = kstrtouint(buf, 10, &new_size_kb);
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if (ret)
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return ret;
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if (new_size_kb > (UINT_MAX / bytes_per_kibi))
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return -EINVAL;
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new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
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mutex_lock(&info->device->mutex);
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if (write_subdevice == NULL ||
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(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
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write_subdevice->async == NULL) {
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mutex_unlock(&info->device->mutex);
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return -EINVAL;
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}
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retval = resize_async_buffer(info->device, write_subdevice,
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write_subdevice->async, new_size);
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mutex_unlock(&info->device->mutex);
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if (retval < 0)
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return retval;
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return count;
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}
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static DEVICE_ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
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show_write_buffer_kb, store_write_buffer_kb);
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static struct attribute *comedi_attrs[] = {
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&dev_attr_max_read_buffer_kb.attr,
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&dev_attr_read_buffer_kb.attr,
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&dev_attr_max_write_buffer_kb.attr,
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&dev_attr_write_buffer_kb.attr,
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NULL
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};
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static const struct attribute_group comedi_sysfs_files = {
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.attrs = comedi_attrs,
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};
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static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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@ -2251,42 +2531,15 @@ int comedi_alloc_board_minor(struct device *hardware_device)
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if (!IS_ERR(csdev))
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info->device->class_dev = csdev;
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dev_set_drvdata(csdev, info);
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retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
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retval = sysfs_create_group(&csdev->kobj, &comedi_sysfs_files);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_max_read_buffer_kb.attr.name);
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comedi_free_board_minor(i);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_read_buffer_kb.attr.name);
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comedi_free_board_minor(i);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_max_write_buffer_kb.attr.name);
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comedi_free_board_minor(i);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_write_buffer_kb.attr.name);
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"comedi: failed to create sysfs attribute files\n");
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comedi_free_board_minor(i);
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return retval;
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}
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return i;
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}
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@ -2367,42 +2620,15 @@ int comedi_alloc_subdevice_minor(struct comedi_device *dev,
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if (!IS_ERR(csdev))
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s->class_dev = csdev;
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dev_set_drvdata(csdev, info);
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retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
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retval = sysfs_create_group(&csdev->kobj, &comedi_sysfs_files);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_max_read_buffer_kb.attr.name);
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comedi_free_subdevice_minor(s);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_read_buffer_kb.attr.name);
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comedi_free_subdevice_minor(s);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_max_write_buffer_kb.attr.name);
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comedi_free_subdevice_minor(s);
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return retval;
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}
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retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
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if (retval) {
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printk(KERN_ERR
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"comedi: "
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"failed to create sysfs attribute file \"%s\".\n",
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dev_attr_write_buffer_kb.attr.name);
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"comedi: failed to create sysfs attribute files\n");
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comedi_free_subdevice_minor(s);
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return retval;
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}
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return i;
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}
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@ -2441,300 +2667,3 @@ struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
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return info;
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}
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EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
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static int resize_async_buffer(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_async *async, unsigned new_size)
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{
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int retval;
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if (new_size > async->max_bufsize)
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return -EPERM;
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if (s->busy) {
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DPRINTK("subdevice is busy, cannot resize buffer\n");
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return -EBUSY;
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}
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if (async->mmap_count) {
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DPRINTK("subdevice is mmapped, cannot resize buffer\n");
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return -EBUSY;
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}
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if (!async->prealloc_buf)
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return -EINVAL;
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/* make sure buffer is an integral number of pages
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* (we round up) */
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new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
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retval = comedi_buf_alloc(dev, s, new_size);
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if (retval < 0)
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return retval;
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if (s->buf_change) {
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retval = s->buf_change(dev, s, new_size);
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if (retval < 0)
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return retval;
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}
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DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
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dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
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return 0;
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}
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/* sysfs attribute files */
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static const unsigned bytes_per_kibi = 1024;
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static ssize_t show_max_read_buffer_kb(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t retval;
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struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned max_buffer_size_kb = 0;
|
||||
struct comedi_subdevice *const read_subdevice =
|
||||
comedi_get_read_subdevice(info);
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (read_subdevice &&
|
||||
(read_subdevice->subdev_flags & SDF_CMD_READ) &&
|
||||
read_subdevice->async) {
|
||||
max_buffer_size_kb = read_subdevice->async->max_bufsize /
|
||||
bytes_per_kibi;
|
||||
}
|
||||
retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static ssize_t store_max_read_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned int new_max_size_kb;
|
||||
unsigned int new_max_size;
|
||||
int ret;
|
||||
struct comedi_subdevice *const read_subdevice =
|
||||
comedi_get_read_subdevice(info);
|
||||
|
||||
ret = kstrtouint(buf, 10, &new_max_size_kb);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
|
||||
return -EINVAL;
|
||||
new_max_size = new_max_size_kb * bytes_per_kibi;
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (read_subdevice == NULL ||
|
||||
(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
|
||||
read_subdevice->async == NULL) {
|
||||
mutex_unlock(&info->device->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
read_subdevice->async->max_bufsize = new_max_size;
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute dev_attr_max_read_buffer_kb = {
|
||||
.attr = {
|
||||
.name = "max_read_buffer_kb",
|
||||
.mode = S_IRUGO | S_IWUSR},
|
||||
.show = &show_max_read_buffer_kb,
|
||||
.store = &store_max_read_buffer_kb
|
||||
};
|
||||
|
||||
static ssize_t show_read_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
ssize_t retval;
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned buffer_size_kb = 0;
|
||||
struct comedi_subdevice *const read_subdevice =
|
||||
comedi_get_read_subdevice(info);
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (read_subdevice &&
|
||||
(read_subdevice->subdev_flags & SDF_CMD_READ) &&
|
||||
read_subdevice->async) {
|
||||
buffer_size_kb = read_subdevice->async->prealloc_bufsz /
|
||||
bytes_per_kibi;
|
||||
}
|
||||
retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static ssize_t store_read_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned int new_size_kb;
|
||||
unsigned int new_size;
|
||||
int retval;
|
||||
int ret;
|
||||
struct comedi_subdevice *const read_subdevice =
|
||||
comedi_get_read_subdevice(info);
|
||||
|
||||
ret = kstrtouint(buf, 10, &new_size_kb);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (new_size_kb > (UINT_MAX / bytes_per_kibi))
|
||||
return -EINVAL;
|
||||
new_size = new_size_kb * bytes_per_kibi;
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (read_subdevice == NULL ||
|
||||
(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
|
||||
read_subdevice->async == NULL) {
|
||||
mutex_unlock(&info->device->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
retval = resize_async_buffer(info->device, read_subdevice,
|
||||
read_subdevice->async, new_size);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
if (retval < 0)
|
||||
return retval;
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute dev_attr_read_buffer_kb = {
|
||||
.attr = {
|
||||
.name = "read_buffer_kb",
|
||||
.mode = S_IRUGO | S_IWUSR | S_IWGRP},
|
||||
.show = &show_read_buffer_kb,
|
||||
.store = &store_read_buffer_kb
|
||||
};
|
||||
|
||||
static ssize_t show_max_write_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
ssize_t retval;
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned max_buffer_size_kb = 0;
|
||||
struct comedi_subdevice *const write_subdevice =
|
||||
comedi_get_write_subdevice(info);
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (write_subdevice &&
|
||||
(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
|
||||
write_subdevice->async) {
|
||||
max_buffer_size_kb = write_subdevice->async->max_bufsize /
|
||||
bytes_per_kibi;
|
||||
}
|
||||
retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static ssize_t store_max_write_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned int new_max_size_kb;
|
||||
unsigned int new_max_size;
|
||||
int ret;
|
||||
struct comedi_subdevice *const write_subdevice =
|
||||
comedi_get_write_subdevice(info);
|
||||
|
||||
ret = kstrtouint(buf, 10, &new_max_size_kb);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
|
||||
return -EINVAL;
|
||||
new_max_size = new_max_size_kb * bytes_per_kibi;
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (write_subdevice == NULL ||
|
||||
(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
|
||||
write_subdevice->async == NULL) {
|
||||
mutex_unlock(&info->device->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
write_subdevice->async->max_bufsize = new_max_size;
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute dev_attr_max_write_buffer_kb = {
|
||||
.attr = {
|
||||
.name = "max_write_buffer_kb",
|
||||
.mode = S_IRUGO | S_IWUSR},
|
||||
.show = &show_max_write_buffer_kb,
|
||||
.store = &store_max_write_buffer_kb
|
||||
};
|
||||
|
||||
static ssize_t show_write_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
ssize_t retval;
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned buffer_size_kb = 0;
|
||||
struct comedi_subdevice *const write_subdevice =
|
||||
comedi_get_write_subdevice(info);
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (write_subdevice &&
|
||||
(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
|
||||
write_subdevice->async) {
|
||||
buffer_size_kb = write_subdevice->async->prealloc_bufsz /
|
||||
bytes_per_kibi;
|
||||
}
|
||||
retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static ssize_t store_write_buffer_kb(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
||||
unsigned int new_size_kb;
|
||||
unsigned int new_size;
|
||||
int retval;
|
||||
int ret;
|
||||
struct comedi_subdevice *const write_subdevice =
|
||||
comedi_get_write_subdevice(info);
|
||||
|
||||
ret = kstrtouint(buf, 10, &new_size_kb);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (new_size_kb > (UINT_MAX / bytes_per_kibi))
|
||||
return -EINVAL;
|
||||
new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
|
||||
|
||||
mutex_lock(&info->device->mutex);
|
||||
if (write_subdevice == NULL ||
|
||||
(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
|
||||
write_subdevice->async == NULL) {
|
||||
mutex_unlock(&info->device->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
retval = resize_async_buffer(info->device, write_subdevice,
|
||||
write_subdevice->async, new_size);
|
||||
mutex_unlock(&info->device->mutex);
|
||||
|
||||
if (retval < 0)
|
||||
return retval;
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute dev_attr_write_buffer_kb = {
|
||||
.attr = {
|
||||
.name = "write_buffer_kb",
|
||||
.mode = S_IRUGO | S_IWUSR | S_IWGRP},
|
||||
.show = &show_write_buffer_kb,
|
||||
.store = &store_write_buffer_kb
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user