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[ALSA] Fix possible deadlocks in sequencer at removal of ports

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Fix possible rwsem deadlocks in sequencer code at removal of
sequencer ports.  The list_lock of port group can be double
locked.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-02-07 14:07:08 +01:00 committed by Jaroslav Kysela
parent 2594d96079
commit 6116ea0741
1 changed files with 1 additions and 1 deletions
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2
sound/core/seq/seq_ports.c
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@ -245,9 +245,9 @@ static void clear_subscriber_list(struct snd_seq_client *client,
list_del(&subs->dest_list); list_del(&subs->dest_list);
else else
list_del(&subs->src_list); list_del(&subs->src_list);
up_write(&agrp->list_mutex);
unsubscribe_port(c, aport, agrp, &subs->info, 1); unsubscribe_port(c, aport, agrp, &subs->info, 1);
kfree(subs); kfree(subs);
up_write(&agrp->list_mutex);
snd_seq_port_unlock(aport); snd_seq_port_unlock(aport);
snd_seq_client_unlock(c); snd_seq_client_unlock(c);
} }