ALSA: mtpav - Fix race in probe
Ingo reported Oops at probing mtpav driver. It's a race between
the irq handler and the rawmidi instance registration.
This patch fixes the order of registration to avoid the race.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/drivers/mtpav.c b/sound/drivers/mtpav.c
index b5e1a71..5b89c088 100644
--- a/sound/drivers/mtpav.c
+++ b/sound/drivers/mtpav.c
@@ -715,6 +715,10 @@
card->private_free = snd_mtpav_free;
+ err = snd_mtpav_get_RAWMIDI(mtp_card);
+ if (err < 0)
+ goto __error;
+
err = snd_mtpav_get_ISA(mtp_card);
if (err < 0)
goto __error;
@@ -724,10 +728,6 @@
snprintf(card->longname, sizeof(card->longname),
"MTPAV on parallel port at 0x%lx", port);
- err = snd_mtpav_get_RAWMIDI(mtp_card);
- if (err < 0)
- goto __error;
-
snd_mtpav_portscan(mtp_card);
snd_card_set_dev(card, &dev->dev);