From 2cbbd78e08bc8645a2a39eba17f0bcbbf467a6f4 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Tue, 8 Jun 2021 11:02:48 +0200 Subject: PM: runtime: Improve path in rpm_idle() when no callback [ Upstream commit 5a2bd1b1c64e1ac5627db3767ac465f18606315c ] 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 Acked-by: Alan Stern Signed-off-by: Rafael J. Wysocki Stable-dep-of: bc80c2e438dc ("PM: runtime: Do not call __rpm_callback() from rpm_idle()") Signed-off-by: Sasha Levin --- drivers/base/power/runtime.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 835a39e84c1d..532d910fe1cf 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -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); -- cgit v1.2.3