This is a note to let you know that I've just added the patch titled
cpufreq / Longhaul: Disable driver by default
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpufreq-longhaul-disable-driver-by-default.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5811bc469c0dbebb4f947800b9b234a9c0a68dc Mon Sep 17 00:00:00 2001
From: RafaÅ? Bilski <rafalbilski@xxxxxxxxxx>
Date: Sat, 15 Dec 2012 00:45:02 +0100
Subject: cpufreq / Longhaul: Disable driver by default
From: RafaÅ? Bilski <rafalbilski@xxxxxxxxxx>
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: RafaÅ? Bilski <rafalbilski@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/longhaul.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- 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 v
* 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@xxxxxxxxxx>");
MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");
Patches currently in stable-queue which might be from rafalbilski@xxxxxxxxxx are
queue-3.4/cpufreq-longhaul-disable-driver-by-default.patch
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