forked from Minki/linux
drm_dp_aux_dev: switch to read_iter/write_iter
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
parent
2ea659a9ef
commit
3941dae15e
@ -32,6 +32,7 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <drm/drm_dp_helper.h>
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#include <drm/drm_crtc.h>
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#include <drm/drmP.h>
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@ -140,101 +141,83 @@ static loff_t auxdev_llseek(struct file *file, loff_t offset, int whence)
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return fixed_size_llseek(file, offset, whence, AUX_MAX_OFFSET);
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}
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static ssize_t auxdev_read(struct file *file, char __user *buf, size_t count,
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loff_t *offset)
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static ssize_t auxdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
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{
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size_t bytes_pending, num_bytes_processed = 0;
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struct drm_dp_aux_dev *aux_dev = file->private_data;
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struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
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loff_t pos = iocb->ki_pos;
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ssize_t res = 0;
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if (!atomic_inc_not_zero(&aux_dev->usecount))
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return -ENODEV;
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bytes_pending = min((loff_t)count, AUX_MAX_OFFSET - (*offset));
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iov_iter_truncate(to, AUX_MAX_OFFSET - pos);
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if (!access_ok(VERIFY_WRITE, buf, bytes_pending)) {
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res = -EFAULT;
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goto out;
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}
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while (bytes_pending > 0) {
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uint8_t localbuf[DP_AUX_MAX_PAYLOAD_BYTES];
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ssize_t todo = min_t(size_t, bytes_pending, sizeof(localbuf));
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while (iov_iter_count(to)) {
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uint8_t buf[DP_AUX_MAX_PAYLOAD_BYTES];
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ssize_t todo = min(iov_iter_count(to), sizeof(buf));
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if (signal_pending(current)) {
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res = num_bytes_processed ?
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num_bytes_processed : -ERESTARTSYS;
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goto out;
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res = -ERESTARTSYS;
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break;
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}
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res = drm_dp_dpcd_read(aux_dev->aux, *offset, localbuf, todo);
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if (res <= 0) {
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res = num_bytes_processed ? num_bytes_processed : res;
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goto out;
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res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);
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if (res <= 0)
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break;
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if (copy_to_iter(buf, res, to) != res) {
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res = -EFAULT;
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break;
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}
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if (__copy_to_user(buf + num_bytes_processed, localbuf, res)) {
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res = num_bytes_processed ?
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num_bytes_processed : -EFAULT;
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goto out;
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}
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bytes_pending -= res;
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*offset += res;
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num_bytes_processed += res;
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res = num_bytes_processed;
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pos += res;
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}
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out:
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if (pos != iocb->ki_pos)
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res = pos - iocb->ki_pos;
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iocb->ki_pos = pos;
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atomic_dec(&aux_dev->usecount);
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wake_up_atomic_t(&aux_dev->usecount);
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return res;
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}
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static ssize_t auxdev_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offset)
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static ssize_t auxdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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{
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size_t bytes_pending, num_bytes_processed = 0;
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struct drm_dp_aux_dev *aux_dev = file->private_data;
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struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
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loff_t pos = iocb->ki_pos;
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ssize_t res = 0;
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if (!atomic_inc_not_zero(&aux_dev->usecount))
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return -ENODEV;
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bytes_pending = min((loff_t)count, AUX_MAX_OFFSET - *offset);
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iov_iter_truncate(from, AUX_MAX_OFFSET - pos);
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if (!access_ok(VERIFY_READ, buf, bytes_pending)) {
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res = -EFAULT;
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goto out;
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}
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while (bytes_pending > 0) {
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uint8_t localbuf[DP_AUX_MAX_PAYLOAD_BYTES];
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ssize_t todo = min_t(size_t, bytes_pending, sizeof(localbuf));
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while (iov_iter_count(from)) {
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uint8_t buf[DP_AUX_MAX_PAYLOAD_BYTES];
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ssize_t todo = min(iov_iter_count(from), sizeof(buf));
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if (signal_pending(current)) {
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res = num_bytes_processed ?
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num_bytes_processed : -ERESTARTSYS;
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goto out;
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res = -ERESTARTSYS;
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break;
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}
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if (__copy_from_user(localbuf,
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buf + num_bytes_processed, todo)) {
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res = num_bytes_processed ?
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num_bytes_processed : -EFAULT;
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goto out;
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if (!copy_from_iter_full(buf, todo, from)) {
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res = -EFAULT;
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break;
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}
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res = drm_dp_dpcd_write(aux_dev->aux, *offset, localbuf, todo);
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if (res <= 0) {
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res = num_bytes_processed ? num_bytes_processed : res;
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goto out;
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}
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bytes_pending -= res;
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*offset += res;
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num_bytes_processed += res;
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res = num_bytes_processed;
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res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);
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if (res <= 0)
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break;
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pos += res;
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}
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out:
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if (pos != iocb->ki_pos)
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res = pos - iocb->ki_pos;
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iocb->ki_pos = pos;
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atomic_dec(&aux_dev->usecount);
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wake_up_atomic_t(&aux_dev->usecount);
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return res;
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@ -251,8 +234,8 @@ static int auxdev_release(struct inode *inode, struct file *file)
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static const struct file_operations auxdev_fops = {
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.owner = THIS_MODULE,
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.llseek = auxdev_llseek,
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.read = auxdev_read,
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.write = auxdev_write,
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.read_iter = auxdev_read_iter,
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.write_iter = auxdev_write_iter,
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.open = auxdev_open,
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.release = auxdev_release,
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};
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