linux-kernel - [PATCH 3.16.y-ckt 003/133] [media] v4l: omap3isp: Fix sub-device power management code

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Message-Id: <1443606681-7124-4-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 30 Sep 2015 10:49:11 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sakari Ailus <sakari.ailus@....fi>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 003/133] [media] v4l: omap3isp: Fix sub-device power management code

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

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

From: Sakari Ailus <sakari.ailus@....fi>

commit 9d39f05490115bf145e5ea03c0b7ec9d3d015b01 upstream.

Commit 813f5c0ac5cc ("media: Change media device link_notify behaviour")
modified the media controller link setup notification API and updated the
OMAP3 ISP driver accordingly. As a side effect it introduced a bug by
turning power on after setting the link instead of before. This results in
sub-devices not being powered down in some cases when they should be. Fix
it.

Fixes: 813f5c0ac5cc [media] media: Change media device link_notify behaviour

Signed-off-by: Sakari Ailus <sakari.ailus@....fi>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/media/platform/omap3isp/isp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 2c7aa6720569..1cc8e219298d 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -823,14 +823,14 @@ static int isp_pipeline_link_notify(struct media_link *link, u32 flags,
 	int ret;
 
 	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
-	    !(link->flags & MEDIA_LNK_FL_ENABLED)) {
+	    !(flags & MEDIA_LNK_FL_ENABLED)) {
 		/* Powering off entities is assumed to never fail. */
 		isp_pipeline_pm_power(source, -sink_use);
 		isp_pipeline_pm_power(sink, -source_use);
 		return 0;
 	}
 
-	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
+	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
 		(flags & MEDIA_LNK_FL_ENABLED)) {
 
 		ret = isp_pipeline_pm_power(source, sink_use);
--
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