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Commit 87fa5af8 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] cio: ensure single load of irq handler pointer 



Add barrier to prevent compiler from reloading pointer to irq handler.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 98c1c682

drivers/s390/cio/airq.c

+2 −0
Original line number Diff line number Diff line
@@ -133,6 +133,8 @@ void do_adapter_IO(u8 isc) 
		while (word) {

			if (word & INDICATOR_MASK) {

				airq = airqs[isc][i];

				/* Make sure gcc reads from airqs only once. */

				barrier();

				if (likely(airq))

					airq->handler(&indicators[isc].byte[i],

						      airq->drv_data);