[media] v4l: omap3isp: Fix async notifier registration order

The async notifier was registered before the v4l2_device was registered and
before the notifier callbacks were set. This could lead to missing the
bound() and complete() callbacks and to attempting to spin_lock() and
uninitialised spin lock.

Also fix unregistering the async notifier in the case of an error --- the
function may not fail anymore after the notifier is registered.

Fixes: da7f3843d2c7 ("[media] omap3isp: Add support for the Device Tree")

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 18d0a87..d1334bb 100644 (file)
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -2000,10 +2000,8 @@ static int isp_register_entities(struct isp_device *isp)
        ret = v4l2_device_register_subdev_nodes(&isp->v4l2_dev);
 
 done:
-       if (ret < 0) {
+       if (ret < 0)
                isp_unregister_entities(isp);
-               v4l2_async_notifier_unregister(&isp->notifier);
-       }
 
        return ret;
 }
@@ -2423,10 +2421,6 @@ static int isp_probe(struct platform_device *pdev)
                ret = isp_of_parse_nodes(&pdev->dev, &isp->notifier);
                if (ret < 0)
                        return ret;
-               ret = v4l2_async_notifier_register(&isp->v4l2_dev,
-                                                  &isp->notifier);
-               if (ret)
-                       return ret;
        } else {
                isp->pdata = pdev->dev.platform_data;
                isp->syscon = syscon_regmap_lookup_by_pdevname("syscon.0");
@@ -2557,18 +2551,27 @@ static int isp_probe(struct platform_device *pdev)
        if (ret < 0)
                goto error_iommu;
 
-       isp->notifier.bound = isp_subdev_notifier_bound;
-       isp->notifier.complete = isp_subdev_notifier_complete;
-
        ret = isp_register_entities(isp);
        if (ret < 0)
                goto error_modules;
 
+       if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+               isp->notifier.bound = isp_subdev_notifier_bound;
+               isp->notifier.complete = isp_subdev_notifier_complete;
+
+               ret = v4l2_async_notifier_register(&isp->v4l2_dev,
+                                                  &isp->notifier);
+               if (ret)
+                       goto error_register_entities;
+       }
+
        isp_core_init(isp, 1);
        omap3isp_put(isp);
 
        return 0;
 
+error_register_entities:
+       isp_unregister_entities(isp);
 error_modules:
        isp_cleanup_modules(isp);
 error_iommu: