From e50f405ecaae7c6b268e842599df33033971f5ed Mon Sep 17 00:00:00 2001
From: Alexander Motin <mav@FreeBSD.org>
Date: Sun, 17 Jul 2016 12:45:58 +0000
Subject: [PATCH] In AHCI_IRQ_MODE_AFTER mode do not clear interrupts below.

This is probably a NOP change since IS register is not activery used for
interrupts below the shared, but it looked odd to clear interrupts we did
not handle.
---
 sys/dev/ahci/ahci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index a1406f60b7b..ee0e95795a9 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -466,6 +466,7 @@ ahci_intr(void *data)
 	} else {	/* AHCI_IRQ_MODE_AFTER */
 		unit = irq->r_irq_rid - 1;
 		is = ATA_INL(ctlr->r_mem, AHCI_IS);
+		is &= (0xffffffff << unit);
 	}
 	/* CCC interrupt is edge triggered. */
 	if (ctlr->ccc)