[3.5.y.z,extended,stable] Patch "cpufreq / Longhaul: Disable driver by default" has been added to staging queue

Message ID 1368614066-25253-1-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques May 15, 2013, 10:34 a.m.
This is a note to let you know that I have just added a patch titled

    cpufreq / Longhaul: Disable driver by default

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 016b981c90d4225f0add628f13f8a3f53a907c77 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Bilski?= <rafalbilski@interia.pl>
Date: Sat, 15 Dec 2012 00:45:02 +0100
Subject: [PATCH] cpufreq / Longhaul: Disable driver by default
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit b5811bc469c0dbebb4f947800b9b234a9c0a68dc upstream.

This is only solution I can think of. User decides if he wants this
driver on his machine. I don't have enough knowledge and time to find
the reason why same code works on some machines and doesn't on others
which use the same, or very similar, chipset and processor.

Signed-off-by: RafaƂ Bilski <rafalbilski@interia.pl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
 drivers/cpufreq/longhaul.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)



diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 53ddbc7..0bf5bd1 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -77,7 +77,7 @@  static unsigned int longhaul_index;
 static int scale_voltage;
 static int disable_acpi_c3;
 static int revid_errata;
+static int enable;

 /* Clock ratios multiplied by 10 */
 static int mults[32];
@@ -965,6 +965,10 @@  static int __init longhaul_init(void)
 	if (!x86_match_cpu(longhaul_id))
 		return -ENODEV;

+	if (!enable) {
+		printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
+		return -ENODEV;
+	}
 #ifdef CONFIG_SMP
 	if (num_online_cpus() > 1) {
 		printk(KERN_ERR PFX "More than 1 CPU detected, "
@@ -1021,6 +1025,10 @@  MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
  * such. */
 module_param(revid_errata, int, 0644);
 MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID");
+/* By default driver is disabled to prevent incompatible
+ * system freeze. */
+module_param(enable, int, 0644);
+MODULE_PARM_DESC(enable, "Enable driver");

 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
 MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");