linux-kernel - [PATCH AUTOSEL 5.10 3/6] media: vb2: use lock if wait

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Message-ID: <20241124125742.3341086-3-sashal@kernel.org>
Date: Sun, 24 Nov 2024 07:57:05 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Hans Verkuil <hverkuil-cisco@...all.nl>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	tfiga@...omium.org,
	m.szyprowski@...sung.com,
	mchehab@...nel.org,
	linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 3/6] media: vb2: use lock if wait_prepare/finish are NULL

From: Hans Verkuil <hverkuil-cisco@...all.nl>

[ Upstream commit 88785982a19daa765e30ab3a605680202cfaee4e ]

If the wait_prepare or wait_finish callback is set, then call it.
If it is NULL and the queue lock pointer is not NULL, then just
unlock/lock that mutex.

This allows simplifying drivers by dropping the wait_prepare and
wait_finish ops (and eventually the vb2_ops_wait_prepare/finish helpers).

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/common/videobuf2/videobuf2-core.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 78ad2b278da4c..93eaff34d5e4d 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1816,7 +1816,10 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
 		 * become ready or for streamoff. Driver's lock is released to
 		 * allow streamoff or qbuf to be called while waiting.
 		 */
-		call_void_qop(q, wait_prepare, q);
+		if (q->ops->wait_prepare)
+			call_void_qop(q, wait_prepare, q);
+		else if (q->lock)
+			mutex_unlock(q->lock);
 
 		/*
 		 * All locks have been released, it is safe to sleep now.
@@ -1826,12 +1829,16 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
 				!list_empty(&q->done_list) || !q->streaming ||
 				q->error);
 
+		if (q->ops->wait_finish)
+			call_void_qop(q, wait_finish, q);
+		else if (q->lock)
+			mutex_lock(q->lock);
+
+		q->waiting_in_dqbuf = 0;
 		/*
 		 * We need to reevaluate both conditions again after reacquiring
 		 * the locks or return an error if one occurred.
 		 */
-		call_void_qop(q, wait_finish, q);
-		q->waiting_in_dqbuf = 0;
 		if (ret) {
 			dprintk(q, 1, "sleep was interrupted\n");
 			return ret;
-- 
2.43.0