linux-kernel - [PATCH 3.16 051/148] media: radio: wl1273: fix interrupt masking on release

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Message-ID: <lsq.1581185940.27480099@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:19:50 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Johan Hovold" <johan@...nel.org>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Hans Verkuil" <hverkuil-cisco@...all.nl>,
        "Matti Aaltonen" <matti.j.aaltonen@...ia.com>
Subject: [PATCH 3.16 051/148] media: radio: wl1273: fix interrupt masking
 on release

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

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: 87d1a50ce451 ("[media] V4L2: WL1273 FM Radio: TI WL1273 FM radio driver")
Cc: Matti Aaltonen <matti.j.aaltonen@...ia.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/radio/radio-wl1273.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/media/radio/radio-wl1273.c
+++ b/drivers/media/radio/radio-wl1273.c
@@ -1142,8 +1142,7 @@ static int wl1273_fm_fops_release(struct
 	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;