linux-kernel - [PATCH] PCI: Do not run NVidia quirks related to MSI with MSI disabled

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Date:	Fri, 23 Jul 2010 22:19:55 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] PCI: Do not run NVidia quirks related to MSI with MSI disabled

From: Rafael J. Wysocki <rjw@...k.pl>

There is no reason to run NVidia-specific quirks related to HT MSI
mappings with MSI disabled via pci=nomsi, so make
__nv_msi_ht_cap_quirk() return immediately in that case.

This allows at least one machine to boot 100% of the time with
pci=nomsi (it still doesn't boot reliably without that).

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16443 .

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/pci/quirks.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/drivers/pci/quirks.c
===================================================================
--- linux-2.6.orig/drivers/pci/quirks.c
+++ linux-2.6/drivers/pci/quirks.c
@@ -2390,6 +2390,9 @@ static void __devinit __nv_msi_ht_cap_qu
 	int pos;
 	int found;
 
+	if (!pci_msi_enabled())
+		return;
+
 	/* check if there is HT MSI cap or enabled on this device */
 	found = ht_check_msi_mapping(dev);
 
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