[PATCH 3.10 20/50] [media] smiapp: Take mutex during PLL update in sensor initialisation

Greg Kroah-Hartman
2015-01-25T18:08:57Z

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

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@linux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/media/i2c/smiapp/smiapp-core.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/media/i2c/smiapp/smiapp-core.c
+++ b/drivers/media/i2c/smiapp/smiapp-core.c
@@ -2629,7 +2629,9 @@ static int smiapp_registered(struct v4l2
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;