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>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
index ae42695c359..68142df7660 100644
--- a/arch/um/drivers/hostaudio_kern.c
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -8,6 +8,7 @@
 #include "linux/slab.h"
 #include "linux/sound.h"
 #include "linux/soundcard.h"
+#include "linux/smp_lock.h"
 #include "asm/uaccess.h"
 #include "init.h"
 #include "os.h"
@@ -198,7 +199,10 @@ static int hostaudio_open(struct inode *inode, struct file *file)
         if (file->f_mode & FMODE_WRITE)
                 w = 1;
 
+        lock_kernel();
         ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+        unlock_kernel();
+
         if (ret < 0) {
                 kfree(state);
                 return ret;
@@ -254,7 +258,9 @@ static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
         if (file->f_mode & FMODE_WRITE)
                 w = 1;
 
+        lock_kernel();
         ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+        unlock_kernel();
 
         if (ret < 0) {
                 printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "