I am not 100% sure of this, but here is what I found.
I checked the video_unregister_device which calls device_unregister.
In drivers/base/core.c:
* device_unregister - unregister device from system.
* We do this in two parts, like we do device_register(). First,
* we remove it from all the subsystems with device_del(), then
* we decrement the reference count via put_device(). If that
* is the final reference count, the device will be cleaned up
* via device_release() above. Otherwise, the structure will
* stick around until the final reference to the device is dropped.
and
* device_release - free device structure.
* This is called once the reference count for the object
* reaches 0. We forward the call to the device's release
* method, which should handle actually freeing the structure.
In device_release:
if (dev->release)
dev->release(dev);
I think this causes the release to be called twice if the device fails
to register. Is this correct?
--
radio_maestro module generates kernel oops and crash
https://bugs.launchpad.net/bugs/357724
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