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usb: gadget: f_fs: use io_data->status consistently

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[ Upstream commit b566d38857 ]

Commit fb1f16d74e ("usb: gadget: f_fs: change ep->status safe in
ffs_epfile_io()") added a new ffs_io_data::status field to fix lifetime
issues in synchronous requests.

While there are no similar lifetime issues for asynchronous requests
(the separate ep member in ffs_io_data avoids them) using the status
field means the USB request can be freed earlier and that there is more
consistency between the synchronous and asynchronous I/O paths.

Cc: Linyu Yuan <quic_linyyuan@quicinc.com>
Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/20221124170430.3998755-1-john@metanate.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 24729b307eef ("usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John Keeping
2022-11-24 17:04:28 +00:00
committed by Greg Kroah-Hartman
parent e8b8582355
commit b55bc52521
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/gadget/function/f_fs.c
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@@ -830,8 +830,7 @@ static void ffs_user_copy_worker(struct work_struct *work)
{
struct ffs_io_data *io_data = container_of(work, struct ffs_io_data,
work);
int ret = io_data->req->status ? io_data->req->status :
io_data->req->actual;
int ret = io_data->status;
bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD;
if (io_data->read && ret > 0) {
@@ -845,8 +844,6 @@ static void ffs_user_copy_worker(struct work_struct *work)
if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd)
eventfd_signal(io_data->ffs->ffs_eventfd, 1);
usb_ep_free_request(io_data->ep, io_data->req);
if (io_data->read)
kfree(io_data->to_free);
ffs_free_buffer(io_data);
@@ -861,6 +858,9 @@ static void ffs_epfile_async_io_complete(struct usb_ep *_ep,
ENTER();
io_data->status = req->status ? req->status : req->actual;
usb_ep_free_request(_ep, req);
INIT_WORK(&io_data->work, ffs_user_copy_worker);
queue_work(ffs->io_completion_wq, &io_data->work);
}