Colin Cross 736899ab70 cpuidle: coupled: fix race condition between pokes and safe state ... commit 9e19b73c30 upstream. The coupled cpuidle waiting loop clears pending pokes before entering the safe state. If a poke arrives just before the pokes are cleared, but after the while loop condition checks, the poke will be lost and the cpu will stay in the safe state until another interrupt arrives. This may cause the cpu that sent the poke to spin in the ready loop with interrupts off until another cpu receives an interrupt, and if no other cpus have interrupts routed to them it can spin forever. Change the return value of cpuidle_coupled_clear_pokes to return if a poke was cleared, and move the need_resched() checks into the callers. In the waiting loop, if a poke was cleared restart the loop to repeat the while condition checks. Reported-by: Neil Zhang <zhangwm@marvell.com> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-09-26 17:18:02 -07:00
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governors	Revert "cpuidle: Quickly notice prediction failure for repeat mode"	2013-08-11 18:35:24 -07:00
coupled.c	cpuidle: coupled: fix race condition between pokes and safe state	2013-09-26 17:18:02 -07:00
cpuidle-calxeda.c	cpuidle: add maintainer entry	2013-04-26 22:30:25 +02:00
cpuidle-kirkwood.c	cpuidle: add maintainer entry	2013-04-26 22:30:25 +02:00
cpuidle.c	cpuidle: fix comment format	2013-04-24 00:54:51 +02:00
cpuidle.h	cpuidle: support multiple drivers	2012-11-15 00:34:23 +01:00
driver.c	cpuidle: initialize the broadcast timer framework	2013-04-01 01:10:28 +02:00
governor.c
Kconfig	cpuidle / kirkwood: remove redundant Kconfig option	2013-04-01 01:10:27 +02:00
Makefile	cpuidle / kirkwood: remove redundant Kconfig option	2013-04-01 01:10:27 +02:00
sysfs.c	cpuidle: fix number of initialized/destroyed states	2013-01-11 23:20:09 +01:00