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Konrad Rzeszutek Wilk 813e8e3d6a cpuidle: Check for dev before deregistering it. ... If not, we could end up in the unfortunate situation where we dereference a NULL pointer b/c we have cpuidle disabled. This is the case when booting under Xen (which uses the ACPI P/C states but disables the CPU idle driver) - and can be easily reproduced when booting with cpuidle.off=1. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8156db4a>] cpuidle_unregister_device+0x2a/0x90 .. snip.. Call Trace: [<ffffffff813b15b4>] acpi_processor_power_exit+0x3c/0x5c [<ffffffff813af0a9>] acpi_processor_stop+0x61/0xb6 [<ffffffff814215bf>] __device_release_driver+0fffff81421653>] device_release_driver+0x23/0x30 [<ffffffff81420ed8>] bus_remove_device+0x108/0x180 [<ffffffff8141d9d9>] device_del+0x129/0x1c0 [<ffffffff813cb4b0>] ? unregister_xenbus_watch+0x1f0/0x1f0 [<ffffffff8141da8e>] device_unregister+0x1e/0x60 [<ffffffff814243e9>] unregister_cpu+0x39/0x60 [<ffffffff81019e03>] arch_unregister_cpu+0x23/0x30 [<ffffffff813c3c51>] handle_vcpu_hotplug_event+0xc1/0xe0 [<ffffffff813cb4f5>] xenwatch_thread+0x45/0x120 [<ffffffff810af010>] ? abort_exclusive_wait+0xb0/0xb0 [<ffffffff8108ec42>] kthread+0xd2/0xf0 [<ffffffff8108eb70>] ? kthread_create_on_node+0x180/0x180 [<ffffffff816ce17c>] ret_from_fork+0x7c/0xb0 [<ffffffff8108eb70>] ? kthread_create_on_node+0x180/0x180 This problem also appears in 3.12 and could be a candidate for backport. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		11 years ago
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governors	cpuidle: Change struct menu_device field types	12 years ago
Kconfig	cpuidle: big.LITTLE: vexpress-TC2 CPU idle driver	12 years ago
Kconfig.arm	ACPI and power management updates for 3.13-rc1	11 years ago
Makefile	ARM: at91: cpuidle: Move driver to drivers/cpuidle	11 years ago
coupled.c	cpuidle: Fix comments in cpuidle core	11 years ago
cpuidle-at91.c	ARM: at91: cpuidle: Move driver to drivers/cpuidle	11 years ago
cpuidle-big_little.c	cpuidle: big.LITTLE: vexpress-TC2 CPU idle driver	12 years ago
cpuidle-calxeda.c	cpuidle: calxeda: add support to use PSCI calls	12 years ago
cpuidle-kirkwood.c	cpuidle-kirkwood.c: simplify use of devm_ioremap_resource()	12 years ago
cpuidle-ux500.c	ARM: ux500: cpuidle: fix section mismatch	11 years ago
cpuidle-zynq.c	ARM: zynq: cpuidle: convert to platform driver	11 years ago
cpuidle.c	cpuidle: Check for dev before deregistering it.	11 years ago
cpuidle.h	cpuidle: support multiple drivers	12 years ago
driver.c	cpuidle: don't call poll_idle_init() for every cpu	11 years ago
governor.c	cpuidle: remove cpuidle_unregister_governor()	11 years ago
sysfs.c	cpuidle: use drv instead of cpuidle_driver in show_current_driver()	11 years ago