linux-kernel - [PATCH v3 03/12] macintosh/via-pmu: Don't clear shift register interrupt flag twice

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Message-Id: <dc2239bf4d037bf85bb1821354534793c3ba2270.1528885172.git.fthain@telegraphics.com.au>
Date:   Wed, 13 Jun 2018 06:38:01 -0400 (EDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Michael Schmitz <schmitzmic@...il.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-m68k@...ts.linux-m68k.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 03/12] macintosh/via-pmu: Don't clear shift register
 interrupt flag twice

The shift register interrupt flag gets cleared in via_pmu_interrupt()
and once again in pmu_sr_intr(). Fix this theoretical race condition.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 drivers/macintosh/via-pmu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index 74065ea410bd..4c1bae5380c2 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -1458,7 +1458,6 @@ pmu_sr_intr(void)
 
 	if (in_8(&via[B]) & TREQ) {
 		printk(KERN_ERR "PMU: spurious SR intr (%x)\n", in_8(&via[B]));
-		out_8(&via[IFR], SR_INT);
 		return NULL;
 	}
 	/* The ack may not yet be low when we get the interrupt */
-- 
2.16.4