* Patch "[media] media/v4l2-ctrls: fix setting autocluster to manual with VIDIOC_S_CTRL" has been added to the 4.3-stable tree
@ 2016-02-13 23:03 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2016-02-13 23:03 UTC (permalink / raw)
To: ao2, gregkh, hans.verkuil, mchehab; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
[media] media/v4l2-ctrls: fix setting autocluster to manual with VIDIOC_S_CTRL
to the 4.3-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-v4l2-ctrls-fix-setting-autocluster-to-manual-with-vidioc_s_ctrl.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 759b26a1d916400a1a20948eb964dea6ad0bd9e9 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ao2@ao2.it>
Date: Wed, 14 Oct 2015 10:57:32 -0300
Subject: [media] media/v4l2-ctrls: fix setting autocluster to manual with VIDIOC_S_CTRL
From: Antonio Ospite <ao2@ao2.it>
commit 759b26a1d916400a1a20948eb964dea6ad0bd9e9 upstream.
Since commit 5d0360a4f027576e5419d4a7c711c9ca0f1be8ca it's not possible
anymore to set auto clusters from auto to manual using VIDIOC_S_CTRL.
For example, setting autogain to manual with gspca/ov534 driver and this
sequence of commands does not work:
v4l2-ctl --set-ctrl=gain_automatic=1
v4l2-ctl --list-ctrls | grep gain_automatic
# The following does not work
v4l2-ctl --set-ctrl=gain_automatic=0
v4l2-ctl --list-ctrls | grep gain_automatic
Changing the value using VIDIOC_S_EXT_CTRLS (like qv4l2 does) works
fine.
The apparent cause by looking at the changes in 5d0360a and comparing
with the code path for VIDIOC_S_EXT_CTRLS seems to be that the code in
v4l2-ctrls.c::set_ctrl() is not calling user_to_new() anymore after
calling update_from_auto_cluster(master).
However the root cause of the problem is that calling
update_from_auto_cluster(master) overrides also the _master_ control
state calling cur_to_new() while it was supposed to only update the
volatile controls.
Calling user_to_new() after update_from_auto_cluster(master) was just
masking the original bug by restoring the correct new value of the
master control before making the changes permanent.
Fix the original bug by making update_from_auto_cluster() not override
the new master control value.
Signed-off-by: Antonio Ospite <ao2@ao2.it>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/media/v4l2-core/v4l2-ctrls.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -3043,7 +3043,7 @@ static void update_from_auto_cluster(str
{
int i;
- for (i = 0; i < master->ncontrols; i++)
+ for (i = 1; i < master->ncontrols; i++)
cur_to_new(master->cluster[i]);
if (!call_op(master, g_volatile_ctrl))
for (i = 1; i < master->ncontrols; i++)
Patches currently in stable-queue which might be from ao2@ao2.it are
queue-4.3/media-v4l2-ctrls-fix-setting-autocluster-to-manual-with-vidioc_s_ctrl.patch
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2016-02-13 23:03 Patch "[media] media/v4l2-ctrls: fix setting autocluster to manual with VIDIOC_S_CTRL" has been added to the 4.3-stable tree gregkh
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