sound: push BKL into open functions
This moves the lock_kernel() call from soundcore_open
to the individual OSS device drivers, where we can deal
with it one driver at a time if needed, or just kill
off the drivers.
All core components in ALSA already provide
adequate locking in their open()-functions
and do not require the big kernel lock, so
there is no need to add the BKL there.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/soundcard.c b/sound/oss/soundcard.c
index 2d9c513..92aa762 100644
--- a/sound/oss/soundcard.c
+++ b/sound/oss/soundcard.c
@@ -210,42 +210,44 @@
printk(KERN_ERR "Invalid minor device %d\n", dev);
return -ENXIO;
}
+ lock_kernel();
switch (dev & 0x0f) {
case SND_DEV_CTL:
dev >>= 4;
if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
request_module("mixer%d", dev);
}
+ retval = -ENXIO;
if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
- return -ENXIO;
+ break;
if (!try_module_get(mixer_devs[dev]->owner))
- return -ENXIO;
+ break;
+
+ retval = 0;
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
- if ((retval = sequencer_open(dev, file)) < 0)
- return retval;
+ retval = sequencer_open(dev, file);
break;
case SND_DEV_MIDIN:
- if ((retval = MIDIbuf_open(dev, file)) < 0)
- return retval;
+ retval = MIDIbuf_open(dev, file);
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
- if ((retval = audio_open(dev, file)) < 0)
- return retval;
+ retval = audio_open(dev, file);
break;
default:
printk(KERN_ERR "Invalid minor device %d\n", dev);
- return -ENXIO;
+ retval = -ENXIO;
}
+ unlock_kernel();
return 0;
}