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Subject: media: imon: Fix race getting ictx->lock
Author: Ricardo Ribalda <riba...@chromium.org>
Date: Mon May 6 21:10:27 2024 +0000
Lets fix a race between mutex_is_lock() and mutex_lock().
<-mutex is not locked
if (!mutex_is_locked(&ictx->lock)) {
unlock = true; <- mutex is locked externaly
mutex_lock(&ictx->lock);
}
Let's use mutex_trylock() that does mutex_is_lock() and mutex_lock()
atomically.
Fix the following cocci warning:
drivers/media/rc/imon.c:1167:1-7: preceding lock on line 1153
Fixes: 23ef710e1a6c ("[media] imon: add conditional locking in change_protocol")
Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/rc/imon.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index 0b55314a8082..8f1361bcce3a 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -1148,10 +1148,7 @@ static int imon_ir_change_protocol(struct rc_dev *rc,
u64 *rc_proto)
memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
- if (!mutex_is_locked(&ictx->lock)) {
- unlock = true;
- mutex_lock(&ictx->lock);
- }
+ unlock = mutex_trylock(&ictx->lock);
retval = send_packet(ictx);
if (retval)
