[PATCH] media: rcar-vin: Move media_device_register to async completion

[Michael Rodin]

From: Steve Longerbeam <steve_longerb...@mentor.com>

The media_device is registered during driver probe, before async
completion, so it is possible for .link_notify to be called before
all devices are bound.

Fix this by moving media_device_register() to rvin_group_notify_complete().
This ensures that all devices are now bound (the rcar-csi2 subdevices and
and video capture devices) before .link_notify can be called.

Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com>
Signed-off-by: Michael Rodin <mro...@de.adit-jv.com>
---
 drivers/media/platform/rcar-vin/rcar-core.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-core.c 
b/drivers/media/platform/rcar-vin/rcar-core.c
index 7440c89..e70f83b 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -253,7 +253,6 @@ static int rvin_group_init(struct rvin_group *group, struct 
rvin_dev *vin)
        struct media_device *mdev = &group->mdev;
        const struct of_device_id *match;
        struct device_node *np;
-       int ret;
 
        mutex_init(&group->lock);
 
@@ -266,7 +265,6 @@ static int rvin_group_init(struct rvin_group *group, struct 
rvin_dev *vin)
        vin_dbg(vin, "found %u enabled VIN's in DT", group->count);
 
        mdev->dev = vin->dev;
-       mdev->ops = &rvin_media_ops;
 
        match = of_match_node(vin->dev->driver->of_match_table,
                              vin->dev->of_node);
@@ -278,11 +276,7 @@ static int rvin_group_init(struct rvin_group *group, 
struct rvin_dev *vin)
 
        media_device_init(mdev);
 
-       ret = media_device_register(&group->mdev);
-       if (ret)
-               rvin_group_cleanup(group);
-
-       return ret;
+       return 0;
 }
 
 static void rvin_group_release(struct kref *kref)
@@ -688,6 +682,8 @@ static int rvin_group_notify_complete(struct 
v4l2_async_notifier *notifier)
                return ret;
        }
 
+       vin->group->mdev.ops = &rvin_media_ops;
+
        /* Register all video nodes for the group. */
        for (i = 0; i < RCAR_VIN_NUM; i++) {
                if (vin->group->vin[i] &&
@@ -736,8 +732,10 @@ static int rvin_group_notify_complete(struct 
v4l2_async_notifier *notifier)
                }
        }
        mutex_unlock(&vin->group->lock);
+       if (ret)
+               return ret;
 
-       return ret;
+       return media_device_register(&vin->group->mdev);
 }
 
 static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
-- 
2.7.4