linux-kernel - Dell Studio 1536 needs pci=nocrs to boot.

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Message-ID: <20111230193704.GA2874@redhat.com>
Date:	Fri, 30 Dec 2011 14:37:05 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	x86@...nel.org, jbarnes@...tuousgeek.org
Subject: Dell Studio 1536 needs pci=nocrs to boot.

Some machines don't boot unless passed pci=nocrs.
(See https://bugzilla.redhat.com/show_bug.cgi?id=770308 for details of
  one report. Waiting on dmidecode output for others).

Currently there is a DMI whitelist, even though the default is on.

This patch extends that dmi list to add a blacklist to automatically
apply disable it when necessary.

Signed-off-by: Dave Jones <davej@...hat.com>

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 404f21a..2704a9c 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -24,6 +24,12 @@ static int __init set_use_crs(const struct dmi_system_id *id)
 	return 0;
 }

+static int __init set_nouse_crs(const struct dmi_system_id *id)
+{
+	pci_use_crs = false;
+	return 0;
+}
+
 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
 	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
 	{
@@ -54,6 +60,18 @@ static const struct dmi_system_id pci_use_crs_table[] __initconst = {
 			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 		},
 	},
+
+	/* Now for the blacklist.. */
+
+	/* https://bugzilla.redhat.com/show_bug.cgi?id=770308 */
+	{
+		.callback = set_nouse_crs,
+		.ident = "Dell Studio 1536",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_BOARD_NAME, "0M273C"),
+		},
+	},
 	{}
 };

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