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authorRafał Bilski <rafalbilski@interia.pl>2012-12-15 00:45:02 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-01-03 13:11:18 +0100
commitb5811bc469c0dbebb4f947800b9b234a9c0a68dc (patch)
tree3c94f1a16b884b765564369972b231a85ae43f7d /drivers
parent56836fb4dab8fe906b934b231b04c33c180f8da5 (diff)
downloadvexpress-lsk-b5811bc469c0dbebb4f947800b9b234a9c0a68dc.tar.gz
cpufreq / Longhaul: Disable driver by default
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: Rafał Bilski <rafalbilski@interia.pl> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpufreq/longhaul.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index f1fa500ac10..1180d536d1e 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.");