spin_unlock_irqrestore(&rh->region_lock, flags); 
static void rh_dec(struct region_hash *rh, region_t region){	unsigned long flags;	struct region *reg;	int should_wake = 0;	read_lock(&rh->hash_lock);	reg = __rh_lookup(rh, region);	read_unlock(&rh->hash_lock);	if (atomic_dec_and_test(&reg->pending)) {		spin_lock_irqsave(&rh->region_lock, flags);		if (atomic_read(&reg->pending)) { /* check race */			spin_unlock_irqrestore(&rh->region_lock, flags);			return;		}		if (reg->state == RH_RECOVERING) {			list_add_tail(&reg->list, &rh->quiesced_regions);		} else {			reg->state = RH_CLEAN;			list_add(&reg->list, &rh->clean_regions);		}		spin_unlock_irqrestore(&rh->region_lock, flags);		should_wake = 1;	}	if (should_wake)		wake();}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/7692c5dd48026d952199c2b97c3418f927cc0407/dm-raid1.c/clean/drivers/md/dm-raid1.c