From 87fa5af80cdd5053b27a546725948c2b74ec82b2 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 26 Mar 2009 15:24:10 +0100 Subject: [PATCH] [S390] cio: ensure single load of irq handler pointer Add barrier to prevent compiler from reloading pointer to irq handler. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/airq.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c index fe6cea15bbaf..d3850dc30e42 100644 --- a/drivers/s390/cio/airq.c +++ b/drivers/s390/cio/airq.c @@ -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); -- 2.39.5