Re: FAILED: patch "[PATCH] media: vb2: core: Finish buffers at the end of the stream" failed to apply to 4.14-stable tree

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

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Hi Greg,

On Thu, Apr 19, 2018 at 06:23:24PM +0200, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 4.14-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.

The attached backported patch should now apply to v4.14-stable.
Backported by changing the path of the file. It was in a different
location in v4.14.x

--
Regards
Sudip

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>From ce5c56f886a88d6bcddcfaaa9ced7de5f8c86ece Mon Sep 17 00:00:00 2001
From: Sakari Ailus <sakari.ailus@linux.intel.com>
Date: Fri, 2 Feb 2018 05:08:59 -0500
Subject: [PATCH] media: vb2: core: Finish buffers at the end of the stream

commit 03703ed1debf777ea845aa9b50ba2e80a5e7dd3c upstream

If buffers were prepared or queued and the buffers were released without
starting the queue, the finish mem op (corresponding to the prepare mem
op) was never called to the buffers.

Before commit a136f59c0a1f there was no need to do this as in such a case
the prepare mem op had not been called yet. Address the problem by
explicitly calling finish mem op when the queue is stopped if the buffer
is in either prepared or queued state.

Fixes: a136f59c0a1f ("[media] vb2: Move buffer cache synchronisation to prepare from queue")

Cc: stable@vger.kernel.org # for v4.13 and up
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
 drivers/media/v4l2-core/videobuf2-core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 6d9adcaa26ba..ffbb178c6918 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1689,6 +1689,15 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	for (i = 0; i < q->num_buffers; ++i) {
 		struct vb2_buffer *vb = q->bufs[i];
 
+		if (vb->state == VB2_BUF_STATE_PREPARED ||
+		    vb->state == VB2_BUF_STATE_QUEUED) {
+			unsigned int plane;
+
+			for (plane = 0; plane < vb->num_planes; ++plane)
+				call_void_memop(vb, finish,
+						vb->planes[plane].mem_priv);
+		}
+
 		if (vb->state != VB2_BUF_STATE_DEQUEUED) {
 			vb->state = VB2_BUF_STATE_PREPARED;
 			call_void_vb_qop(vb, buf_finish, vb);
-- 
2.11.0