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To:     Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc:     Michael Schmitz <schmitzmic@gmail.com>,
        <linuxppc-dev@lists.ozlabs.org>, <linux-m68k@lists.linux-m68k.org>,
        <linux-kernel@vger.kernel.org>
Message-Id: <dc2239bf4d037bf85bb1821354534793c3ba2270.1528423341.git.fthain@telegraphics.com.au>
In-Reply-To: <cover.1528423341.git.fthain@telegraphics.com.au>
References: <cover.1528423341.git.fthain@telegraphics.com.au>
From:   Finn Thain <fthain@telegraphics.com.au>
Subject: [PATCH v2 03/12] macintosh/via-pmu: Don't clear shift register
 interrupt flag twice
Date:   Thu,  7 Jun 2018 22:24:28 -0400 (EDT)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@linux-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