exynos4-is: Register v4l2_async notifier only when sensors are available

This allows driver initialization again if no camera sensors are
specified. It fixes regression introduced in commit 9cb4cf023f4d793ca
"exynos4-is: Add support for asynchronous sensor subddevs registration"

Change-Id: I02379781ff51142f02dc3a4c3f0bc7b0da999e1f
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 55a0900..4b40dbd 100644 (file)
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -1661,16 +1661,20 @@ static int fimc_md_probe(struct platform_device *pdev)
                goto err_attr;
        }
 
-       fmd->subdev_notifier.subdevs = fmd->async_subdevs;
-       fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
-       fmd->subdev_notifier.bound = subdev_notifier_bound;
-       fmd->subdev_notifier.complete = subdev_notifier_complete;
-       fmd->num_sensors = 0;
-
-       ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
-                                          &fmd->subdev_notifier);
-       if (ret)
-               goto err_clk_p;
+
+       if (fmd->num_sensors > 0) {
+               fmd->subdev_notifier.subdevs = fmd->async_subdevs;
+               fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
+               fmd->subdev_notifier.bound = subdev_notifier_bound;
+               fmd->subdev_notifier.complete = subdev_notifier_complete;
+               fmd->num_sensors = 0;
+
+               ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
+                                                  &fmd->subdev_notifier);
+
+               if (ret)
+                       goto err_clk_p;
+       }
 
        return 0;