From 863a181c0bb346b2494c4815d31d21c8dc355bea Mon Sep 17 00:00:00 2001
From: Marcus Overhagen <marcus@overhagen.de>
Date: Fri, 14 Sep 2012 18:16:51 +0200
Subject: [PATCH] make sure there are no pending interrupts during setup

---
 .../kernel/busses/scsi/ahci/ahci_controller.cpp        | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/add-ons/kernel/busses/scsi/ahci/ahci_controller.cpp b/src/add-ons/kernel/busses/scsi/ahci/ahci_controller.cpp
index 24ded54f21..311825f88b 100644
--- a/src/add-ons/kernel/busses/scsi/ahci/ahci_controller.cpp
+++ b/src/add-ons/kernel/busses/scsi/ahci/ahci_controller.cpp
@@ -122,6 +122,10 @@ AHCIController::Init()
 		return B_ERROR;
 	}
 
+	// make sure interrupts are disabled
+	fRegs->ghc &= ~GHC_IE;
+	FlushPostedWrites();
+
 	if (ResetController() < B_OK) {
 		TRACE("controller reset failed\n");
 		goto err;
@@ -194,6 +198,12 @@ AHCIController::Init()
 		}
 	}
 
+	// clear any pending interrupts
+	uint32 interruptsPending;
+	interruptsPending = fRegs->is;
+	fRegs->is = interruptsPending; 
+	FlushPostedWrites();
+
 	// enable interrupts
 	fRegs->ghc |= GHC_IE;
 	FlushPostedWrites();