xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ACPI / PM: Hold ACPI scan lock over the "freeze" sleep state

Browse Source 
The "freeze" sleep state suffers from the same issue that was
addressed by commit ad07277e82 (ACPI / PM: Hold acpi_scan_lock over
system PM transitions) for ACPI sleep states, that is, things break
if ->remove() is called for devices whose system resume callbacks
haven't been executed yet.

It also can be addressed in the same way, by holding the ACPI scan
lock over the "freeze" sleep state and PM transitions to and from
that state, but ->begin() and ->end() platform operations for the
"freeze" sleep state are needed for this purpose.

This change has been tested on Acer Aspire S5 with Thunderbolt.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2014-05-15 23:29:57 +02:00
parent fad16dd9c9
commit 1f0b63866f
3 changed files with 40 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/suspend.h
View File

@@ -187,6 +187,11 @@ struct platform_suspend_ops {
void (*recover)(void);
};
struct platform_freeze_ops {
int (*begin)(void);
void (*end)(void);
};
#ifdef CONFIG_SUSPEND
/**
* suspend_set_ops - set platform dependent suspend operations
@@ -194,6 +199,7 @@ struct platform_suspend_ops {
*/
extern void suspend_set_ops(const struct platform_suspend_ops *ops);
extern int suspend_valid_only_mem(suspend_state_t state);
extern void freeze_set_ops(const struct platform_freeze_ops *ops);
extern void freeze_wake(void);
/**
@@ -220,6 +226,7 @@ extern int pm_suspend(suspend_state_t state);
static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
static inline void freeze_wake(void) {}
#endif /* !CONFIG_SUSPEND */