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>

sound/oss/msnd_pinnacle.c

@@ -756,12 +756,15 @@ static int dev_open(struct inode *inode, struct file *file)
 	int minor = iminor(inode);
 	int err = 0;
 
+	lock_kernel();
 	if (minor == dev.dsp_minor) {
 		if ((file->f_mode & FMODE_WRITE &&
 		     test_bit(F_AUDIO_WRITE_INUSE, &dev.flags)) ||
 		    (file->f_mode & FMODE_READ &&
-		     test_bit(F_AUDIO_READ_INUSE, &dev.flags)))
-			return -EBUSY;
+		     test_bit(F_AUDIO_READ_INUSE, &dev.flags))) {
+			err = -EBUSY;
+			goto out;
+		}
 
 		if ((err = dsp_open(file)) >= 0) {
 			dev.nresets = 0;
@@ -782,7 +785,8 @@ static int dev_open(struct inode *inode, struct file *file)
 		/* nothing */
 	} else
 		err = -EINVAL;
-
+out:
+	unlock_kernel();
 	return err;
 }