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[CPUFREQ] Missing "unregister_cpu_notifier" in powernow-k8.c

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It appears that when powernow-k8 finds that

    No compatible ACPI _PSS objects found.

 and suggests

    Try again with latest BIOS.

 it fails the module load, but does not unregister the cpu_notifier that was
 registered in powernowk8_init

 This ends up leaving freed memory on the cpu notifier list for some other
 poor module (e.g. md/raid5) to come along and trip over.

 The following might be a partial fix, but I suspect there is probably other
 clean-up that is needed.

 ( https://bugzilla.novell.com/show_bug.cgi?id=655215 has full dmesg traces).

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Neil Brown 2010-11-24 11:28:01 +11:00 committed by Dave Jones
parent dd9c1549ed
commit ac81831449
1 changed files with 8 additions and 1 deletions
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9
arch/x86/kernel/cpu/cpufreq/powernow-k8.c
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@ -1537,6 +1537,7 @@ static struct notifier_block cpb_nb = {
static int __cpuinit powernowk8_init(void)
{
unsigned int i, supported_cpus = 0, cpu;
int rv;
for_each_online_cpu(i) {
int rc;
@ -1574,7 +1575,13 @@ static int __cpuinit powernowk8_init(void)
(cpb_enabled ? "on" : "off"));
}
return cpufreq_register_driver(&cpufreq_amd64_driver);
rv = cpufreq_register_driver(&cpufreq_amd64_driver);
if (rv < 0 && boot_cpu_has(X86_FEATURE_CPB)) {
unregister_cpu_notifier(&cpb_nb);
msrs_free(msrs);
msrs = NULL;
}
return rv;
}
/* driver entry point for term */