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[media] v4l: Allow calling v4l2_device_register_subdev_nodes() multiple times

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Previously multiple calls to v4l2_device_register_subdev_nodes() ended up
corrupting memory and leaking some, too. This patch changes the behaviour so
that sub-devices the device nodes of which are already registered are
ignored.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sebastian Reichel 2017-02-14 20:38:49 -02:00 committed by Mauro Carvalho Chehab
parent 974f4a385c
commit db0f4691d9
1 changed files with 3 additions and 0 deletions
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3
drivers/media/v4l2-core/v4l2-device.c
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@ -235,6 +235,9 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
continue;
if (sd->devnode)
continue;
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
err = -ENOMEM;