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authorAlan Stern <stern@rowland.harvard.edu>2010-12-01 00:14:42 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2010-12-24 15:02:41 +0100
commitc7b61de5b7b17f0df34dc7d2f8b9576f8bd36fce (patch)
treed8cf6be1aab175839973d2c76060bd41d65b2ed5 /include/linux/pm.h
parent5262a47502adcfc3a64403120768f528418a3b79 (diff)
PM / Runtime: Add synchronous runtime interface for interrupt handlers (v3)
This patch (as1431c) makes the synchronous runtime-PM interface suitable for use in interrupt handlers. Subsystems can call the new pm_runtime_irq_safe() function to tell the PM core that a device's runtime_suspend and runtime_resume callbacks should be invoked with interrupts disabled and the spinlock held. This permits the pm_runtime_get_sync() and the new pm_runtime_put_sync_suspend() routines to be called from within interrupt handlers. When a device is declared irq-safe in this way, the PM core increments the parent's usage count, so the parent will never be runtime suspended. This prevents difficult situations in which an irq-safe device can't resume because it is forced to wait for its non-irq-safe parent. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include/linux/pm.h')
-rw-r--r--include/linux/pm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 40f3f45702ba..61f2066e6852 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -486,6 +486,7 @@ struct dev_pm_info {
unsigned int run_wake:1;
unsigned int runtime_auto:1;
unsigned int no_callbacks:1;
+ unsigned int irq_safe:1;
unsigned int use_autosuspend:1;
unsigned int timer_autosuspends:1;
enum rpm_request request;