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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@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Finn Thain 2018-07-02 04:21:18 -04:00 committed by Michael Ellerman
parent 576d5290d6
commit 7ad94699a9
1 changed files with 0 additions and 1 deletions
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drivers/macintosh/via-pmu.c
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@ -1421,7 +1421,6 @@ 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 */