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gadget/function/f_fs.c: use put iov_iter into io_data

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both on aio and non-aio sides

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-01-31 23:23:35 -05:00
parent de2080d41b
commit c993c39b86
1 changed files with 25 additions and 61 deletions
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86
drivers/usb/gadget/function/f_fs.c
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@ -144,10 +144,9 @@ struct ffs_io_data {
bool read;
struct kiocb *kiocb;
const struct iovec *iovec;
unsigned long nr_segs;
char __user *buf;
size_t len;
struct iov_iter data;
const void *to_free;
char *buf;
struct mm_struct *mm;
struct work_struct work;
@ -649,29 +648,10 @@ static void ffs_user_copy_worker(struct work_struct *work)
io_data->req->actual;
if (io_data->read && ret > 0) {
int i;
size_t pos = 0;
/*
* Since req->length may be bigger than io_data->len (after
* being rounded up to maxpacketsize), we may end up with more
* data then user space has space for.
*/
ret = min_t(int, ret, io_data->len);
use_mm(io_data->mm);
for (i = 0; i < io_data->nr_segs; i++) {
size_t len = min_t(size_t, ret - pos,
io_data->iovec[i].iov_len);
if (!len)
break;
if (unlikely(copy_to_user(io_data->iovec[i].iov_base,
&io_data->buf[pos], len))) {
ret = -EFAULT;
break;
}
pos += len;
}
ret = copy_to_iter(io_data->buf, ret, &io_data->data);
if (iov_iter_count(&io_data->data))
ret = -EFAULT;
unuse_mm(io_data->mm);
}
@ -684,7 +664,7 @@ static void ffs_user_copy_worker(struct work_struct *work)
io_data->kiocb->private = NULL;
if (io_data->read)
kfree(io_data->iovec);
kfree(io_data->to_free);
kfree(io_data->buf);
kfree(io_data);
}
@ -743,6 +723,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
* before the waiting completes, so do not assign to 'gadget' earlier
*/
struct usb_gadget *gadget = epfile->ffs->gadget;
size_t copied;
spin_lock_irq(&epfile->ffs->eps_lock);
/* In the meantime, endpoint got disabled or changed. */
@ -750,34 +731,21 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
spin_unlock_irq(&epfile->ffs->eps_lock);
return -ESHUTDOWN;
}
data_len = iov_iter_count(&io_data->data);
/*
* Controller may require buffer size to be aligned to
* maxpacketsize of an out endpoint.
*/
data_len = io_data->read ?
usb_ep_align_maybe(gadget, ep->ep, io_data->len) :
io_data->len;
if (io_data->read)
data_len = usb_ep_align_maybe(gadget, ep->ep, data_len);
spin_unlock_irq(&epfile->ffs->eps_lock);
data = kmalloc(data_len, GFP_KERNEL);
if (unlikely(!data))
return -ENOMEM;
if (io_data->aio && !io_data->read) {
int i;
size_t pos = 0;
for (i = 0; i < io_data->nr_segs; i++) {
if (unlikely(copy_from_user(&data[pos],
io_data->iovec[i].iov_base,
io_data->iovec[i].iov_len))) {
ret = -EFAULT;
goto error;
}
pos += io_data->iovec[i].iov_len;
}
} else {
if (!io_data->read &&
unlikely(__copy_from_user(data, io_data->buf,
io_data->len))) {
if (!io_data->read) {
copied = copy_from_iter(data, data_len, &io_data->data);
if (copied != data_len) {
ret = -EFAULT;
goto error;
}
@ -876,10 +844,8 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
*/
ret = ep->status;
if (io_data->read && ret > 0) {
ret = min_t(size_t, ret, io_data->len);
if (unlikely(copy_to_user(io_data->buf,
data, ret)))
ret = copy_to_iter(data, ret, &io_data->data);
if (unlikely(iov_iter_count(&io_data->data)))
ret = -EFAULT;
}
}
@ -903,13 +869,13 @@ ffs_epfile_write(struct file *file, const char __user *buf, size_t len,
loff_t *ptr)
{
struct ffs_io_data io_data;
struct iovec iov = {.iov_base = buf, .iov_len = len};
ENTER();
io_data.aio = false;
io_data.read = false;
io_data.buf = (char * __user)buf;
io_data.len = len;
iov_iter_init(&io_data.data, WRITE, &iov, 1, len);
return ffs_epfile_io(file, &io_data);
}
@ -918,13 +884,14 @@ static ssize_t
ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr)
{
struct ffs_io_data io_data;
struct iovec iov = {.iov_base = buf, .iov_len = len};
ENTER();
io_data.aio = false;
io_data.read = true;
io_data.buf = buf;
io_data.len = len;
io_data.to_free = NULL;
iov_iter_init(&io_data.data, READ, &iov, 1, len);
return ffs_epfile_io(file, &io_data);
}
@ -981,9 +948,7 @@ static ssize_t ffs_epfile_aio_write(struct kiocb *kiocb,
io_data->aio = true;
io_data->read = false;
io_data->kiocb = kiocb;
io_data->iovec = iovec;
io_data->nr_segs = nr_segs;
io_data->len = kiocb->ki_nbytes;
iov_iter_init(&io_data->data, WRITE, iovec, nr_segs, kiocb->ki_nbytes);
io_data->mm = current->mm;
kiocb->private = io_data;
@ -1021,9 +986,8 @@ static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb,
io_data->aio = true;
io_data->read = true;
io_data->kiocb = kiocb;
io_data->iovec = iovec_copy;
io_data->nr_segs = nr_segs;
io_data->len = kiocb->ki_nbytes;
io_data->to_free = iovec_copy;
iov_iter_init(&io_data->data, READ, iovec_copy, nr_segs, kiocb->ki_nbytes);
io_data->mm = current->mm;
kiocb->private = io_data;
@ -1032,8 +996,8 @@ static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb,
res = ffs_epfile_io(kiocb->ki_filp, io_data);
if (res != -EIOCBQUEUED) {
kfree(io_data->to_free);
kfree(io_data);
kfree(iovec_copy);
}
return res;
}