From e22db3f99cf8392b67f1149b4f6d56c78a398ecb Mon Sep 17 00:00:00 2001
From: mav <mav@FreeBSD.org>
Date: Sun, 17 Jul 2016 12:31:31 +0000
Subject: [PATCH] Do not consider the last interrupt shared if there are enough
 interrupts for all channels.

---
 sys/dev/ahci/ahci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index ec42b3c1f54b..a1406f60b7b0 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -416,7 +416,8 @@ ahci_setup_interrupt(device_t dev)
 		else if (ctlr->numirqs == 1 || i >= ctlr->channels ||
 		    (ctlr->ccc && i == ctlr->cccv))
 			ctlr->irqs[i].mode = AHCI_IRQ_MODE_ALL;
-		else if (i == ctlr->numirqs - 1)
+		else if (ctlr->channels > ctlr->numirqs &&
+		    i == ctlr->numirqs - 1)
 			ctlr->irqs[i].mode = AHCI_IRQ_MODE_AFTER;
 		else
 			ctlr->irqs[i].mode = AHCI_IRQ_MODE_ONE;