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07b0e5d49d
The emux-synth driver has a possible AB/BA mutex deadlock at unloading
the emu10k1 driver:
snd_emux_free() ->
snd_emux_detach_seq(): mutex_lock(&emu->register_mutex) ->
snd_seq_delete_kernel_client() ->
snd_seq_free_client(): mutex_lock(®ister_mutex)
snd_seq_release() ->
snd_seq_free_client(): mutex_lock(®ister_mutex) ->
snd_seq_delete_all_ports() ->
snd_emux_unuse(): mutex_lock(&emu->register_mutex)
Basically snd_emux_detach_seq() doesn't need a protection of
emu->register_mutex as it's already being unregistered. So, we can
get rid of this for avoiding the deadlock.
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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|---|---|---|
| .. | ||
| emux_effect.c | ||
| emux_hwdep.c | ||
| emux_nrpn.c | ||
| emux_oss.c | ||
| emux_proc.c | ||
| emux_seq.c | ||
| emux_synth.c | ||
| emux_voice.h | ||
| emux.c | ||
| Makefile | ||
| soundfont.c | ||