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/vwsnd.c b/sound/oss/vwsnd.c
index 20b3b32..99c94c4 100644
--- a/sound/oss/vwsnd.c
+++ b/sound/oss/vwsnd.c
@@ -2921,6 +2921,7 @@
DBGE("(inode=0x%p, file=0x%p)\n", inode, file);
+ lock_kernel();
INC_USE_COUNT;
for (devc = vwsnd_dev_list; devc; devc = devc->next_dev)
if ((devc->audio_minor & ~0x0F) == (minor & ~0x0F))
@@ -2928,6 +2929,7 @@
if (devc == NULL) {
DEC_USE_COUNT;
+ unlock_kernel();
return -ENODEV;
}
@@ -2936,11 +2938,13 @@
mutex_unlock(&devc->open_mutex);
if (file->f_flags & O_NONBLOCK) {
DEC_USE_COUNT;
+ unlock_kernel();
return -EBUSY;
}
interruptible_sleep_on(&devc->open_wait);
if (signal_pending(current)) {
DEC_USE_COUNT;
+ unlock_kernel();
return -ERESTARTSYS;
}
mutex_lock(&devc->open_mutex);
@@ -2993,6 +2997,7 @@
file->private_data = devc;
DBGRV();
+ unlock_kernel();
return 0;
}
@@ -3062,15 +3067,18 @@
DBGEV("(inode=0x%p, file=0x%p)\n", inode, file);
INC_USE_COUNT;
+ lock_kernel();
for (devc = vwsnd_dev_list; devc; devc = devc->next_dev)
if (devc->mixer_minor == iminor(inode))
break;
if (devc == NULL) {
DEC_USE_COUNT;
+ unlock_kernel();
return -ENODEV;
}
file->private_data = devc;
+ unlock_kernel();
return 0;
}