linux-kernel - [PATCH] PCI: Disable AER with pci=nomsi

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Message-ID: <20090916204022.GA30729@basil.fritz.box>
Date:	Wed, 16 Sep 2009 22:40:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: Disable AER with pci=nomsi

PCI: Disable AER with pci=nomsi

When booting with pci=nomsi aer causes lost interrupts and
lockdep inversions.

So check if MSIs are not disabled before initializing the aer
driver.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/pci/pcie/aer/aerdrv.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/drivers/pci/pcie/aer/aerdrv.c
===================================================================
--- linux.orig/drivers/pci/pcie/aer/aerdrv.c
+++ linux/drivers/pci/pcie/aer/aerdrv.c
@@ -316,6 +316,8 @@ static int __init aer_service_init(void)
 {
 	if (pcie_aer_disable)
 		return -ENXIO;
+	if (!pci_msi_enabled())
+		return -ENXIO;
 	return pcie_port_service_register(&aerdriver);
 }
 
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