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[media] radio-mr800: fix locking order 

Don't hold the lock before unregistering the device, since when the
device is unregistered the datastruct containing the lock may be freed
(if the refcount went to 0).

Also fixed the framework documentation that erroneously suggested the
wrong locking order as well.

Reported-by: David Ellingsworth <david@identd.dyndns.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: David Ellingsworth <david@identd.dyndns.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2010-10-11 12:36:37 -03:00 committed by Mauro Carvalho Chehab
parent 1cd72781db
commit 9c84d89bf1
2 changed files with 2 additions and 2 deletions
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2
Documentation/video4linux/v4l2-framework.txt
View File

@ -488,7 +488,7 @@ also waits in the code, then you should do the same to allow other processes
to access the device node while the first process is waiting for something.
The implementation of a hotplug disconnect should also take the lock before
calling v4l2_device_disconnect and video_unregister_device.
calling v4l2_device_disconnect.
video_device registration
-------------------------

2
drivers/media/radio/radio-mr800.c
View File

@ -285,8 +285,8 @@ static void usb_amradio_disconnect(struct usb_interface *intf)
mutex_lock(&radio->lock);
v4l2_device_disconnect(&radio->v4l2_dev);
video_unregister_device(&radio->videodev);
mutex_unlock(&radio->lock);
video_unregister_device(&radio->videodev);
}
/* vidioc_querycap - query device capabilities */