diff options
| author | Neil Brown <neilb@suse.de> | 2010-11-24 11:28:01 +1100 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2011-03-01 18:49:44 -0500 |
| commit | ac818314499b707a97690d5ee835e6ba40a407c1 (patch) | |
| tree | 2ab6d022d87e5fad728be268cc3ea5b70d73b6d3 /arch/x86 | |
| parent | dd9c1549edef02290edced639f67b54a25abbe0e (diff) | |
[CPUFREQ] Missing "unregister_cpu_notifier" in powernow-k8.c
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c index 35c7e65e59b..302963fb4dc 100644 --- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c @@ -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 */ |