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[S390] cio: ensure single load of irq handler pointer

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

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2009-03-26 15:24:10 +01:00
committed by Martin Schwidefsky
parent 98c1c68252
commit 87fa5af80c
1 changed files with 2 additions and 0 deletions
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drivers/s390/cio/airq.c
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@@ -133,6 +133,8 @@ void do_adapter_IO(u8 isc)
while (word) { while (word) {
if (word & INDICATOR_MASK) { if (word & INDICATOR_MASK) {
airq = airqs[isc][i]; airq = airqs[isc][i];
/* Make sure gcc reads from airqs only once. */
barrier();
if (likely(airq)) if (likely(airq))
airq->handler(&indicators[isc].byte[i], airq->handler(&indicators[isc].byte[i],
airq->drv_data); airq->drv_data);