smiapp: Take mutex during PLL update in sensor initialisation

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>

diff --git a/drivers/media/i2c/smiapp/smiapp-core.c b/drivers/media/i2c/smiapp/smiapp-core.c
index b280216..de8bc35 100644 (file)
--- 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_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;