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| author | Pingfan Liu <kernelfans@gmail.com> | 2018-07-31 11:51:32 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-08-06 13:35:20 +0300 |
| commit | 55f2503c3b69328735e88031ff8d6ba291bd952b (patch) | |
| tree | c89f476f4866d1e3ee11aa8b8601c68a23e3b025 /Documentation/power/suspend-and-cpuhotplug.txt | |
| parent | 82837ad5bda79cd13d64b9abad92e7872a06bc65 (diff) | |
| download | linux-55f2503c3b69328735e88031ff8d6ba291bd952b.tar.xz | |
PM / reboot: Eliminate race between reboot and suspend
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 <kernelfans@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/power/suspend-and-cpuhotplug.txt')
| -rw-r--r-- | Documentation/power/suspend-and-cpuhotplug.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/power/suspend-and-cpuhotplug.txt b/Documentation/power/suspend-and-cpuhotplug.txt index 6f55eb960a6d..a8751b8df10e 100644 --- a/Documentation/power/suspend-and-cpuhotplug.txt +++ b/Documentation/power/suspend-and-cpuhotplug.txt @@ -32,7 +32,7 @@ More details follow: sysfs file | v - Acquire pm_mutex lock + Acquire system_transition_mutex lock | v Send PM_SUSPEND_PREPARE @@ -96,10 +96,10 @@ execution during resume): * thaw tasks * send PM_POST_SUSPEND notifications -* Release pm_mutex lock. +* Release system_transition_mutex lock. -It is to be noted here that the pm_mutex lock is acquired at the very +It is to be noted here that the system_transition_mutex lock is acquired at the very beginning, when we are just starting out to suspend, and then released only after the entire cycle is complete (i.e., suspend + resume). |