unsigned long flags;  spin_lock_irqsave(&lo->lo_lock, flags); 
static void loop_add_bio(struct loop_device *lo, struct bio *bio){	unsigned long flags;	spin_lock_irqsave(&lo->lo_lock, flags);	if (lo->lo_biotail) {		lo->lo_biotail->bi_next = bio;		lo->lo_biotail = bio;	} else		lo->lo_bio = lo->lo_biotail = bio;	spin_unlock_irqrestore(&lo->lo_lock, flags);	up(&lo->lo_bh_mutex);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/35a82d1a53e1a9ad54efafcc940f9335beaed5c3/loop.c/buggy/drivers/block/loop.c