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media: radio: wl1273: fix interrupt masking on release

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commit 1091eb830627625dcf79958d99353c2391f41708 upstream.

If a process is interrupted while accessing the radio device and the
core lock is contended, release() could return early and fail to update
the interrupt mask.

Note that the return value of the v4l2 release file operation is
ignored.

Fixes: 87d1a50ce4 ("[media] V4L2: WL1273 FM Radio: TI WL1273 FM radio driver")
Cc: stable <stable@vger.kernel.org>     # 2.6.38
Cc: Matti Aaltonen <matti.j.aaltonen@nokia.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2019-10-10 10:13:32 -03:00 • committed by Greg Kroah-Hartman
commit 3e8d9d1c46
1 changed files with 1 additions and 2 deletions
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3
drivers/media/radio/radio-wl1273.c
View file

@ -1148,8 +1148,7 @@ static int wl1273_fm_fops_release(struct file *file)
if (radio->rds_users > 0) {
radio->rds_users--;
if (radio->rds_users == 0) {
if (mutex_lock_interruptible(&core->lock))
return -EINTR;
mutex_lock(&core->lock);
radio->irq_flags &= ~WL1273_RDS_EVENT;