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authorPingfan Liu <kernelfans@gmail.com>2018-07-31 16:51:32 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-08-06 12:35:20 +0200
commit55f2503c3b69328735e88031ff8d6ba291bd952b (patch)
treec89f476f4866d1e3ee11aa8b8601c68a23e3b025 /kernel/freezer.c
parent82837ad5bda79cd13d64b9abad92e7872a06bc65 (diff)
downloadlwn-55f2503c3b69328735e88031ff8d6ba291bd952b.tar.gz
lwn-55f2503c3b69328735e88031ff8d6ba291bd952b.zip
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 'kernel/freezer.c')
-rw-r--r--kernel/freezer.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c
index 6f56a9e219fa..b162b74611e4 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -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;