linux-kernel - [PATCH 3.12 096/176] smiapp: Take mutex during PLL update in sensor initialisation

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Message-Id: <6b77d12ba98e4e0217131f0029ad298487338626.1422455352.git.jslaby@suse.cz>
Date:	Wed, 28 Jan 2015 15:28:46 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 096/176] smiapp: Take mutex during PLL update in sensor initialisation

From: Sakari Ailus <sakari.ailus@...ux.intel.com>

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

===============

commit f85698cd296f08218a7750f321e94607da128600 upstream.

The mutex does not serialise anything in this case but avoids a lockdep
warning from the control framework.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/media/i2c/smiapp/smiapp-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/i2c/smiapp/smiapp-core.c b/drivers/media/i2c/smiapp/smiapp-core.c
index 371ca22843ee..4bfe83ffd577 100644
--- a/drivers/media/i2c/smiapp/smiapp-core.c
+++ b/drivers/media/i2c/smiapp/smiapp-core.c
@@ -2625,7 +2625,9 @@ static int smiapp_registered(struct v4l2_subdev *subdev)
 		pll->flags |= SMIAPP_PLL_FLAG_OP_PIX_CLOCK_PER_LANE;
 	pll->scale_n = sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN];
 
+	mutex_lock(&sensor->mutex);
 	rval = smiapp_update_mode(sensor);
+	mutex_unlock(&sensor->mutex);
 	if (rval) {
 		dev_err(&client->dev, "update mode failed\n");
 		goto out_nvm_release;
-- 
2.2.2

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