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Rafael J. Wysocki 32bdfac546 PM: Do not hold dpm_list_mtx while disabling/enabling nonboot CPUs ... We shouldn't hold dpm_list_mtx while executing [disable|enable]_nonboot_cpus(), because theoretically this may lead to a deadlock as shown by the following example (provided by Johannes Berg): CPU 3 CPU 2 CPU 1 suspend/hibernate something: rtnl_lock() device_pm_lock() -> mutex_lock(&dpm_list_mtx) mutex_lock(&dpm_list_mtx) linkwatch_work -> rtnl_lock() disable_nonboot_cpus() -> flush CPU 3 workqueue Fortunately, device drivers are supposed to stop any activities that might lead to the registration of new device objects way before disable_nonboot_cpus() is called, so it shouldn't be necessary to hold dpm_list_mtx over the entire late part of device suspend and early part of device resume. Thus, during the late suspend and the early resume of devices acquire dpm_list_mtx only when dpm_list is going to be traversed and release it right after that. This patch is reported to fix the regressions tracked as http://bugzilla.kernel.org/show_bug.cgi?id=13245. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: Miles Lane <miles.lane@gmail.com> Tested-by: Ming Lei <tom.leiming@gmail.com>		16 years ago
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Kconfig	…
Makefile	…
console.c	…
disk.c	PM: Do not hold dpm_list_mtx while disabling/enabling nonboot CPUs	16 years ago
main.c	PM: Do not hold dpm_list_mtx while disabling/enabling nonboot CPUs	16 years ago
power.h	…
poweroff.c	…
process.c	…
snapshot.c	…
swap.c	…
swsusp.c	…
user.c	…