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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-07-27 23:47:12 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-28 08:31:58 -0700 |
| commit | b032bf70df2e43149ce2b4e9a865b076c6140753 (patch) | |
| tree | ba022a0bc85598a29e21b7aa3f101c8043c24024 /drivers/cpuidle | |
| parent | 9ffc1699e36abd5baee188c8e36b1bb27d0d4278 (diff) | |
| download | lwn-b032bf70df2e43149ce2b4e9a865b076c6140753.tar.gz lwn-b032bf70df2e43149ce2b4e9a865b076c6140753.zip | |
ACPI/CPUIDLE: prevent setting pm_idle to NULL
pm_idle_save resp. pm_idle_old can be NULL when the restore code in
acpi_processor_cst_has_changed() resp. cpuidle_uninstall_idle_handler()
is called. This can set pm_idle unconditinally to NULL, which causes the
kernel to panic when calling pm_idle in the x86 idle code. This was
covered by an extra check for !pm_idle in the x86 idle code, which was
removed during the x86 idle code refactoring.
Instead of restoring the pm_idle check in the x86 code prevent the
acpi/cpuidle code to set pm_idle to NULL.
Reported by: Dhaval Giani http://lkml.org/lkml/2008/7/2/309
Based on a debug patch from Ingo Molnar
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 5405769020a1..5ce07b517c58 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -94,7 +94,7 @@ void cpuidle_install_idle_handler(void) */ void cpuidle_uninstall_idle_handler(void) { - if (enabled_devices && (pm_idle != pm_idle_old)) { + if (enabled_devices && pm_idle_old && (pm_idle != pm_idle_old)) { pm_idle = pm_idle_old; cpuidle_kick_cpus(); } |