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[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>
hifive-unleashed-5.1
Naga Chumbalkar 2011-03-09 14:02:49 +00:00 committed by Dave Jones
parent a5abba989d
commit 1f858ef2fb
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
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@ -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,