sound: OSS: mpu401, fix deadlock

mpu401_chk_version is called with a spin lock already held. Don't take it
again.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/oss/mpu401.c

@@ -926,31 +926,21 @@ static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV];
 static void mpu401_chk_version(int n, struct mpu_config *devc)
 {
 	int tmp;
-	unsigned long flags;
 
 	devc->version = devc->revision = 0;
 
-	spin_lock_irqsave(&devc->lock,flags);
-	if ((tmp = mpu_cmd(n, 0xAC, 0)) < 0)
-	{
-		spin_unlock_irqrestore(&devc->lock,flags);
+	tmp = mpu_cmd(n, 0xAC, 0);
+	if (tmp < 0)
 		return;
-	}
 	if ((tmp & 0xf0) > 0x20)	/* Why it's larger than 2.x ??? */
-	{
-		spin_unlock_irqrestore(&devc->lock,flags);
 		return;
-	}
 	devc->version = tmp;
 
-	if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0)
-	{
+	if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) {
 		devc->version = 0;
-		spin_unlock_irqrestore(&devc->lock,flags);
 		return;
 	}
 	devc->revision = tmp;
-	spin_unlock_irqrestore(&devc->lock,flags);
 }
 
 int attach_mpu401(struct address_info *hw_config, struct module *owner)