Venkatesh Pallipadi dcb84f335b cpuidle acpi driver: fix oops on AC<->DC ... cpuidle and acpi driver interaction bug with the way cpuidle_register_driver() is called. Due to this bug, there will be oops on AC<->DC on some systems, where they support C-states in one DC and not in AC. The current code does ON BOOT: Look at CST and other C-state info to see whether more than C1 is supported. If it is, then acpi processor_idle does a cpuidle_register_driver() call, which internally enables the device. ON CST change notification (AC<->DC) and on suspend-resume: acpi driver temporarily disables device, updates the device with any new C-states, and reenables the device. The problem is is on boot, there are no C2, C3 states supported and we skip the register. Later on AC<->DC, we may get a CST notification and we try to reevaluate CST and enabled the device, without actually registering it. This causes breakage as we try to create /sys fs sub directory, without the parent directory which is created at register time. Thanks to Sanjeev for reporting the problem here. http://bugzilla.kernel.org/show_bug.cgi?id=10394 Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>		2008-06-11 19:13:45 -04:00
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governors	pm qos infrastructure and interface	2008-02-05 09:44:22 -08:00
cpuidle.c	cpuidle acpi driver: fix oops on AC<->DC	2008-06-11 19:13:45 -04:00
cpuidle.h
driver.c
governor.c
Kconfig	ACPI: CONFIG_CPU_IDLE=ACPI by default	2007-11-19 22:22:37 -05:00
Makefile
sysfs.c	cpuidle: fix cpuidle time and usage overflow	2008-03-26 00:45:26 -04:00