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authorNaga Chumbalkar <nagananda.chumbalkar@hp.com>2011-03-09 15:02:49 +0100
committerDave Jones <davej@redhat.com>2011-03-09 18:33:15 +0100
commit1f858ef2fbabdc5e645644010a31a40c32e397c9 (patch)
tree8d9d0306d0cc275e72b9fa34101f844e5a573ebe /arch
parentLinux 2.6.38-rc8 (diff)
downloadlinux-1f858ef2fbabdc5e645644010a31a40c32e397c9.tar.xz
linux-1f858ef2fbabdc5e645644010a31a40c32e397c9.zip
[CPUFREQ] pcc-cpufreq: don't load driver if get_freq fails during init.
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 <nagananda.chumbalkar@hp.com> CC: stable@kernel.org Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
index 4f6f679f2799..4a5a42b842ad 100644
--- 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(unsigned int cpu)
cmd_incomplete:
iowrite16(0, &pcch_hdr->status);
spin_unlock(&pcc_lock);
- return -EINVAL;
+ return 0;
}
static int pcc_cpufreq_target(struct cpufreq_policy *policy,