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cx88: hold device lock during sub-driver initialization
commit 1d6213a upstream. cx8802_blackbird_probe makes a device node for the mpeg sub-device before it has been added to dev->drvlist. If the device is opened during that time, the open succeeds but request_acquire cannot be called, so the reference count remains zero. Later, when the device is closed, the reference count becomes negative --- uh oh. Close the race by holding core->lock during probe and not releasing until the device is in drvlist and initialization finished. Previously the BKL prevented this race. Reported-by: Andreas Huber <hobrom@gmx.at> Tested-by: Andi Huber <hobrom@gmx.at> Tested-by: Marlon de Boer <marlon@hyves.nl> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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