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When a driver module is unloaded and the last still open file is a raw MIDI device, the card and its devices will be actually freed in the snd_card_file_remove() call when that file is closed. Afterwards, rmidi and rmidi->card point into freed memory, so the module pointer is likely to be garbage. (This was introduced by commit 9a1b64caac82aa02cb74587ffc798e6f42c6170a.) Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Reported-by: Krzysztof Foltman <wdev@foltman.com> Cc: 2.6.30-2.6.35 <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>