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PM / reboot: Eliminate race between reboot and suspend

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At present, "systemctl suspend" and "shutdown" can run in parrallel. A
system can suspend after devices_shutdown(), and resume. Then the shutdown
task goes on to power off. This causes many devices are not really shut
off. Hence replacing reboot_mutex with system_transition_mutex (renamed
from pm_mutex) to achieve the exclusion. The renaming of pm_mutex as
system_transition_mutex can be better to reflect the purpose of the mutex.

Signed-off-by: Pingfan Liu <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Pingfan Liu 2018-07-31 16:51:32 +08:00 • committed by Rafael J. Wysocki
commit 55f2503c3b
10 changed files with 40 additions and 36 deletions
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4
kernel/freezer.c
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@ -15,7 +15,9 @@
atomic_t system_freezing_cnt = ATOMIC_INIT(0);
EXPORT_SYMBOL(system_freezing_cnt);
/* indicate whether PM freezing is in effect, protected by pm_mutex */
/* indicate whether PM freezing is in effect, protected by
* system_transition_mutex
*/
bool pm_freezing;
bool pm_nosig_freezing;