linux-kernel - [PATCH 4.9 001/118] media: videobuf2-v4l2: drop WARN_ON in vb2_warn_zero

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Date:   Fri, 22 Mar 2019 12:14:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Matthias Maennich <maennich@...gle.com>
Subject: [PATCH 4.9 001/118] media: videobuf2-v4l2: drop WARN_ON in vb2_warn_zero_bytesused()

4.9-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 5e99456c20f712dcc13d9f6ca4278937d5367355 upstream.

Userspace shouldn't set bytesused to 0 for output buffers.
vb2_warn_zero_bytesused() warns about this (only once!), but it also
calls WARN_ON(1), which is confusing since it is not immediately clear
that it warns about a 0 value for bytesused.

Just drop the WARN_ON as it serves no purpose.

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Acked-by: Ezequiel Garcia <ezequiel@...labora.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: Matthias Maennich <maennich@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/v4l2-core/videobuf2-v4l2.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -146,7 +146,6 @@ static void vb2_warn_zero_bytesused(stru
 		return;
 
 	check_once = true;
-	WARN_ON(1);
 
 	pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
 	if (vb->vb2_queue->allow_zero_bytesused)