diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2022-08-22 14:18:17 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-09-07 22:53:48 +0300 |
| commit | 5950e5d574c636a07dd21a872c2f8b41f6d20c55 (patch) | |
| tree | 77419bad4e34bcffa13046fc8c673b67276ccd7b /kernel/power/main.c | |
| parent | 0b9d46fc5ef7a457cc635b30b010081228cb81ac (diff) | |
| download | linux-5950e5d574c636a07dd21a872c2f8b41f6d20c55.tar.xz | |
freezer: Have {,un}lock_system_sleep() save/restore flags
Rafael explained that the reason for having both PF_NOFREEZE and
PF_FREEZER_SKIP is that {,un}lock_system_sleep() is callable from
kthread context that has previously called set_freezable().
In preparation of merging the flags, have {,un}lock_system_slee() save
and restore current->flags.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220822114648.725003428@infradead.org
Diffstat (limited to 'kernel/power/main.c')
| -rw-r--r-- | kernel/power/main.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index e3694034b753..dae3d17919e6 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -21,14 +21,16 @@ #ifdef CONFIG_PM_SLEEP -void lock_system_sleep(void) +unsigned int lock_system_sleep(void) { + unsigned int flags = current->flags; current->flags |= PF_FREEZER_SKIP; mutex_lock(&system_transition_mutex); + return flags; } EXPORT_SYMBOL_GPL(lock_system_sleep); -void unlock_system_sleep(void) +void unlock_system_sleep(unsigned int flags) { /* * Don't use freezer_count() because we don't want the call to @@ -46,7 +48,8 @@ void unlock_system_sleep(void) * Which means, if we use try_to_freeze() here, it would make them * enter the refrigerator, thus causing hibernation to lockup. */ - current->flags &= ~PF_FREEZER_SKIP; + if (!(flags & PF_FREEZER_SKIP)) + current->flags &= ~PF_FREEZER_SKIP; mutex_unlock(&system_transition_mutex); } EXPORT_SYMBOL_GPL(unlock_system_sleep); @@ -263,16 +266,17 @@ static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { + unsigned int sleep_flags; const char * const *s; + int error = -EINVAL; int level; char *p; int len; - int error = -EINVAL; p = memchr(buf, '\n', n); len = p ? p - buf : n; - lock_system_sleep(); + sleep_flags = lock_system_sleep(); level = TEST_FIRST; for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) @@ -282,7 +286,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, break; } - unlock_system_sleep(); + unlock_system_sleep(sleep_flags); return error ? error : n; } |