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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-29 01:27:44 +0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-03-30 11:58:06 +0400 |
| commit | 9505626d7bfeb5bd4b85acb483831ac640b2a5e8 (patch) | |
| tree | 70e19eeda29ed3c98b628381eed2a3ce75ee398f /drivers | |
| parent | e252675fb722d4a307cc380a06a905f03cf9951c (diff) | |
| download | linux-9505626d7bfeb5bd4b85acb483831ac640b2a5e8.tar.xz | |
ACPI: Fix unprotected smp_processor_id() in acpi_processor_cst_has_changed()
The acpi_processor_cst_has_changed() function is invoked from a
CPU_ONLINE or CPU_DEAD function, which might well execute on CPU 0
even though the CPU being hotplugged is some other CPU. In addition,
acpi_processor_cst_has_changed() invokes smp_processor_id() without
protection, resulting in splats when onlining CPUs.
This commit therefore changes the smp_processor_id() to pr->id, as is
used elsewhere in the code, for example, in acpi_processor_add().
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Tested-by: Yong Zhang <yong.zhang0@gmail.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 0e8e2de2ed3e..9e57b06d1f24 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1159,8 +1159,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr) * to make the code that updates C-States be called once. */ - if (smp_processor_id() == 0 && - cpuidle_get_driver() == &acpi_idle_driver) { + if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { cpuidle_pause_and_lock(); /* Protect against cpu-hotplug */ |