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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-01-05 02:18:42 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-01-09 13:09:16 +0100 |
| commit | 7bf4e594c28afc67bc120a380ca774e43ca496d8 (patch) | |
| tree | 8f8620cca96c6a29eb8c3a1f7c31e350f8e96ae8 /drivers/base/power/power.h | |
| parent | 32bfa56ac158c1ebcc82df2518860f824be5e5be (diff) | |
| download | lwn-7bf4e594c28afc67bc120a380ca774e43ca496d8.tar.gz lwn-7bf4e594c28afc67bc120a380ca774e43ca496d8.zip | |
PM / wakeup: Do not fail dev_pm_attach_wake_irq() unnecessarily
Returning an error code from dev_pm_attach_wake_irq() if
device_wakeup_attach_irq() called by it returns an error is
pointless, because the wakeup source used by it may be deleted
by user space via sysfs at any time and in particular right after
dev_pm_attach_wake_irq() has returned. Moreover, it requires
the callers of dev_pm_attach_wake_irq() to create that wakeup
source via device_wakeup_enable() upfront, but that obviously is
racy with respect to the sysfs-based manipulations of it.
To avoid the race, modify device_wakeup_attach_irq() to check
that the wakeup source it is going to use is there (and return
early otherwise), make it void (as it cannot fail after that
change) and make dev_pm_attach_wake_irq() simply call it for
the device unconditionally.
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/power/power.h')
| -rw-r--r-- | drivers/base/power/power.h | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index 7beee75399d4..21244c53e377 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -41,20 +41,15 @@ extern void dev_pm_disable_wake_irq_check(struct device *dev); #ifdef CONFIG_PM_SLEEP -extern int device_wakeup_attach_irq(struct device *dev, - struct wake_irq *wakeirq); +extern void device_wakeup_attach_irq(struct device *dev, struct wake_irq *wakeirq); extern void device_wakeup_detach_irq(struct device *dev); extern void device_wakeup_arm_wake_irqs(void); extern void device_wakeup_disarm_wake_irqs(void); #else -static inline int -device_wakeup_attach_irq(struct device *dev, - struct wake_irq *wakeirq) -{ - return 0; -} +static inline void device_wakeup_attach_irq(struct device *dev, + struct wake_irq *wakeirq) {} static inline void device_wakeup_detach_irq(struct device *dev) { |