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media: imon: Fix race getting ictx->lock

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[ Upstream commit 24147897507cd3a7d63745d1518a638bf4132238 ]

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: 23ef710e1a ("[media] imon: add conditional locking in change_protocol")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ricardo Ribalda
2024-05-06 21:10:27 +00:00
committed by Greg Kroah-Hartman
parent 8576a730a4
commit 2e13203b8d
1 changed files with 1 additions and 4 deletions
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5
drivers/media/rc/imon.c
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@@ -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)); memcpy(ictx->usb_tx_buf, &ir_proto_packet, sizeof(ir_proto_packet));
if (!mutex_is_locked(&ictx->lock)) { unlock = mutex_trylock(&ictx->lock);
unlock = true;
mutex_lock(&ictx->lock);
}
retval = send_packet(ictx); retval = send_packet(ictx);
if (retval) if (retval)