[PATCH] s390: enable interrupts on error path

Interrupts can stay disabled if an error occurred in _chp_add().  Use
spin_unlock_irq on the error paths to reenable interrupts.

Signed-off-by: Stefan Bader <shbader@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/s390/cio/chsc.c

@@ -635,13 +635,13 @@ __chp_add(struct subchannel_id schid, void *data)
 		if (sch->schib.pmcw.chpid[i] == chp->id) {
 			if (stsch(sch->schid, &sch->schib) != 0) {
 				/* Endgame. */
-				spin_unlock(&sch->lock);
+				spin_unlock_irq(&sch->lock);
 				return -ENXIO;
 			}
 			break;
 		}
 	if (i==8) {
-		spin_unlock(&sch->lock);
+		spin_unlock_irq(&sch->lock);
 		return 0;
 	}
 	sch->lpm = ((sch->schib.pmcw.pim &