linux-kernel - [PATCH 1/2] [media] media-device: check before unregister if mdev was registered

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Date:	Thu, 10 Sep 2015 15:03:14 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org
Subject: [PATCH 1/2] [media] media-device: check before unregister if mdev was registered

Most media functions that unregister, check if the corresponding register
function succeed before. So these functions can safely be called even if a
registration was never made or the component as already been unregistered.

Add the same check to media_device_unregister() function for consistency.

This will also allow to split the media_device_register() function in an
initialization and registration functions without the need to change the
generic cleanup functions and error code paths for all the media drivers.

Suggested-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
---

 drivers/media/media-device.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 1312e93ebd6e..745defb34b33 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -574,6 +574,8 @@ EXPORT_SYMBOL_GPL(__media_device_register);
  * media_device_unregister - unregister a media device
  * @mdev:	The media device
  *
+ * If the media device has never been registered this function will
+ * return immediately.
  */
 void media_device_unregister(struct media_device *mdev)
 {
@@ -582,6 +584,10 @@ void media_device_unregister(struct media_device *mdev)
 	struct media_link *link, *tmp_link;
 	struct media_interface *intf, *tmp_intf;
 
+	/* Check if mdev was ever registered at all */
+	if (!media_devnode_is_registered(&mdev->devnode))
+		return;
+
 	/* Remove interface links from the media device */
 	list_for_each_entry_safe(link, tmp_link, &mdev->links,
 				 graph_obj.list) {
-- 
2.4.3

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