This is a note to let you know that I've just added the patch titled
[CPUFREQ] pcc-cpufreq: don't load driver if get_freq fails during init.
to the 2.6.37-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:
pcc-cpufreq-don-t-load-driver-if-get_freq-fails-during-init.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 1f858ef2fbabdc5e645644010a31a40c32e397c9 Mon Sep 17 00:00:00 2001
From: Naga Chumbalkar <[email protected]>
Date: Wed, 9 Mar 2011 14:02:49 +0000
Subject: [CPUFREQ] pcc-cpufreq: don't load driver if get_freq fails during init.
From: Naga Chumbalkar <[email protected]>
commit 1f858ef2fbabdc5e645644010a31a40c32e397c9 upstream.
Return 0 on failure. This will cause the initialization of the driver
to fail and prevent the driver from loading if the BIOS cannot handle
the PCC interface command to "get frequency". Otherwise, the driver
will load and display a very high value like "4294967274" (which is
actually -EINVAL) for frequency:
# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
4294967274
Signed-off-by: Naga Chumbalkar <[email protected]>
Signed-off-by: Dave Jones <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
@@ -195,7 +195,7 @@ static unsigned int pcc_get_freq(unsigne
cmd_incomplete:
iowrite16(0, &pcch_hdr->status);
spin_unlock(&pcc_lock);
- return -EINVAL;
+ return 0;
}
static int pcc_cpufreq_target(struct cpufreq_policy *policy,
Patches currently in stable-queue which might be from
[email protected] are
queue-2.6.37/pcc-cpufreq-don-t-load-driver-if-get_freq-fails-during-init.patch
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