commit 56b1c72a75ec44a98aca8bbd71ac869a6f54e036
author Takashi Sakamoto <o-takashi@sakamocchi.jp> Sun Oct 18 22:58:37 2015 +0900
committer Takashi Iwai <tiwai@suse.de> Mon Oct 19 11:58:21 2015 +0200
tree bf621224f4e442b98875597c4e69765bf0ec8dec
parent bd04809bbe4c1f749650bb990c969112a5e10aef

ALSA: firewire-lib: avoid NULL pointer dereference after closing MIDI port

When asynchronous MIDI port is closed before callbacked, the callback
function causes NULL pointer dereference to missing MIDI substream.

This commit fixes this bug.

Fixes: e8a40d9bcb23('ALSA: firewire-lib: schedule work again when MIDI substream has rest of MIDI messages')
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>