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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-26 12:12:08 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-06 13:57:01 +0100
commit0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f (patch)
tree28017e02257ab291f966247ad61d37e670c0a320 /drivers/base
parentc2eac4d3a115e2f511844e7bcf73f4e877fbf5da (diff)
downloadlinux-0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f.tar.bz2
PM / core: Add SMART_SUSPEND driver flag
Define and document a SMART_SUSPEND flag to instruct bus types and PM domains that the system suspend callbacks provided by the driver can cope with runtime-suspended devices, so from the driver's perspective it should be safe to leave devices in runtime suspend during system suspend. Setting that flag may also cause middle-layer code (bus types, PM domains etc.) to skip invocations of the ->suspend_late and ->suspend_noirq callbacks provided by the driver if the device is in runtime suspend at the beginning of the "late" phase of the system-wide suspend transition, in which case the driver's system-wide resume callbacks may be invoked back-to-back with its ->runtime_suspend callback, so the driver has to be able to cope with that too. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index c0135cd95ada..8d9024017645 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1652,6 +1652,9 @@ static int device_prepare(struct device *dev, pm_message_t state)
if (dev->power.syscore)
return 0;
+ WARN_ON(dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
+ !pm_runtime_enabled(dev));
+
/*
* If a device's parent goes into runtime suspend at the wrong time,
* it won't be possible to resume the device. To prevent this we