linux-kernel - Patch "media: media/v4l2-ctrls: volatiles should not generate CH_VALUE" has been added to the 3.18-stable tree

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Date:   Wed, 04 Apr 2018 17:32:38 +0200
From:   <gregkh@...uxfoundation.org>
To:     mchehab@...pensource.com, gregkh@...uxfoundation.org,
        hans.verkuil@...co.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, mchehab@...radead.org,
        mchehab@....samsung.com, ricardo.ribalda@...il.com
Cc:     <stable@...r.kernel.org>, <stable-commits@...r.kernel.org>
Subject: Patch "media: media/v4l2-ctrls: volatiles should not generate CH_VALUE" has been added to the 3.18-stable tree


This is a note to let you know that I've just added the patch titled

    media: media/v4l2-ctrls: volatiles should not generate CH_VALUE

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-media-v4l2-ctrls-volatiles-should-not-generate-ch_value.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@...r.kernel.org> know about it.


>From foo@baz Wed Apr  4 17:30:18 CEST 2018
From: Mauro Carvalho Chehab <mchehab@...pensource.com>
Date: Wed, 28 Mar 2018 15:12:35 -0300
Subject: media: media/v4l2-ctrls: volatiles should not generate CH_VALUE
To: Linux Media Mailing List <linux-media@...r.kernel.org>, stable@...r.kernel.org
Cc: Ricardo Ribalda <ricardo.ribalda@...il.com>, Mauro Carvalho Chehab <mchehab@...radead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Hans Verkuil <hans.verkuil@...co.com>, Mauro Carvalho Chehab <mchehab@....samsung.com>, Mauro Carvalho Chehab <mchehab@...pensource.com>
Message-ID: <1663cf48e2eb96405c5d6d874020aa9925ee217f.1522260310.git.mchehab@...pensource.com>

From: Ricardo Ribalda <ricardo.ribalda@...il.com>

Volatile controls should not generate CH_VALUE events.

Set has_changed to false to prevent this happening.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/v4l2-core/v4l2-ctrls.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1619,6 +1619,15 @@ static int cluster_changed(struct v4l2_c
 
 		if (ctrl == NULL)
 			continue;
+		/*
+		 * Set has_changed to false to avoid generating
+		 * the event V4L2_EVENT_CTRL_CH_VALUE
+		 */
+		if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
+			ctrl->has_changed = false;
+			continue;
+		}
+
 		for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
 			ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
 				ctrl->p_cur, ctrl->p_new);


Patches currently in stable-queue which might be from mchehab@...pensource.com are

queue-3.18/media-v4l2-compat-ioctl32.c-copy-m.userptr-in-put_v4l2_plane32.patch
queue-3.18/media-v4l2-compat-ioctl32.c-avoid-sizeof-type.patch
queue-3.18/media-v4l2-compat-ioctl32.c-drop-pr_info-for-unknown-buffer-type.patch
queue-3.18/media-v4l2-compat-ioctl32-use-compat_u64-for-video-standard.patch
queue-3.18/media-v4l2-compat-ioctl32.c-add-missing-vidioc_prepare_buf.patch
queue-3.18/vb2-v4l2_buf_flag_done-is-set-after-dqbuf.patch
queue-3.18/media-v4l2-compat-ioctl32.c-refactor-compat-ioctl32-logic.patch
queue-3.18/media-v4l2-ctrls-fix-sparse-warning.patch
queue-3.18/media-v4l2-compat-ioctl32.c-fix-ctrl_is_pointer.patch
queue-3.18/media-v4l2-compat-ioctl32.c-move-helper-functions-to-__get-put_v4l2_format32.patch
queue-3.18/media-media-v4l2-ctrls-volatiles-should-not-generate-ch_value.patch
queue-3.18/media-v4l2-compat-ioctl32.c-don-t-copy-back-the-result-for-certain-errors.patch
queue-3.18/media-v4l2-compat-ioctl32.c-make-ctrl_is_pointer-work-for-subdevs.patch
queue-3.18/media-v4l2-compat-ioctl32.c-fix-the-indentation.patch
queue-3.18/media-v4l2-compat-ioctl32-copy-v4l2_window-global_alpha.patch
queue-3.18/media-v4l2-ioctl.c-don-t-copy-back-the-result-for-enotty.patch
queue-3.18/media-v4l2-compat-ioctl32.c-copy-clip-list-in-put_v4l2_window32.patch
queue-3.18/media-v4l2-compat-ioctl32-initialize-a-reserved-field.patch