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PM: runtime: Improve path in rpm_idle() when no callback

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[ Upstream commit 5a2bd1b1c6 ]

When pm_runtime_no_callbacks() has been called for a struct device to set
the dev->power.no_callbacks flag for it, it enables rpm_idle() to take a
slightly quicker path by assuming that a ->runtime_idle() callback would
have returned 0 to indicate success.

A device that does not have the dev->power.no_callbacks flag set for it,
may still be missing a corresponding ->runtime_idle() callback, in which
case the slower path in rpm_idle() is taken. Let's improve the behaviour
for this case, by aligning code to the quicker path.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Stable-dep-of: bc80c2e438dc ("PM: runtime: Do not call __rpm_callback() from rpm_idle()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ulf Hansson
2021-06-08 11:02:48 +02:00
committed by Greg Kroah-Hartman
parent 46026bb057
commit 2cbbd78e08
1 changed files with 5 additions and 5 deletions
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10
drivers/base/power/runtime.c
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@@ -464,7 +464,10 @@ static int rpm_idle(struct device *dev, int rpmflags)
/* Pending requests need to be canceled. */
dev->power.request = RPM_REQ_NONE;
if (dev->power.no_callbacks)
callback = RPM_GET_CALLBACK(dev, runtime_idle);
/* If no callback assume success. */
if (!callback || dev->power.no_callbacks)
goto out;
/* Carry out an asynchronous or a synchronous idle notification. */
@@ -480,10 +483,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
dev->power.idle_notification = true;
callback = RPM_GET_CALLBACK(dev, runtime_idle);
if (callback)
retval = __rpm_callback(callback, dev);
retval = __rpm_callback(callback, dev);
dev->power.idle_notification = false;
wake_up_all(&dev->power.wait_queue);