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Date:   Fri, 22 Mar 2019 12:12:34 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Hans Verkuil <>,
        Ezequiel Garcia <>,
        Mauro Carvalho Chehab <>,
        Matthias Maennich <>
Subject: [PATCH 4.19 001/280] media: videobuf2-v4l2: drop WARN_ON in vb2_warn_zero_bytesused()

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


From: Hans Verkuil <>

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 <>
Acked-by: Ezequiel Garcia <>
Signed-off-by: Mauro Carvalho Chehab <>
Cc: Matthias Maennich <>
Signed-off-by: Greg Kroah-Hartman <>

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

--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -145,7 +145,6 @@ static void vb2_warn_zero_bytesused(stru
 	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)

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