From: Ladislav Michl <ladis@linux-mips.org>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Ulf Hansson <ulf.hansson@linaro.org>,
Tony Lindgren <tony@atomide.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH] PM/runtime: Do not needlessly call ktime_get
Date: Thu, 10 Jan 2019 10:51:25 +0100 [thread overview]
Message-ID: <20190110095125.GA4491@lenoch> (raw)
pm_runtime_autosuspend_expiration calls ktime_get even when
its returned value may be unused. Therefore get current time
later and remove gotos while there.
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
---
NOTE: Depends on Vincent's "[PATCH v2] PM/runtime: Fix autosuspend_delay
on 32bits arch"!
drivers/base/power/runtime.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 457be03b744d..836b1b8784eb 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -129,24 +129,21 @@ static void pm_runtime_cancel_pending(struct device *dev)
u64 pm_runtime_autosuspend_expiration(struct device *dev)
{
int autosuspend_delay;
- u64 last_busy, expires = 0;
- u64 now = ktime_to_ns(ktime_get());
+ u64 expires;
if (!dev->power.use_autosuspend)
- goto out;
+ return 0;
autosuspend_delay = READ_ONCE(dev->power.autosuspend_delay);
if (autosuspend_delay < 0)
- goto out;
-
- last_busy = READ_ONCE(dev->power.last_busy);
+ return 0;
- expires = last_busy + (u64)autosuspend_delay * NSEC_PER_MSEC;
- if (expires <= now)
- expires = 0; /* Already expired. */
+ expires = READ_ONCE(dev->power.last_busy);
+ expires += (u64)autosuspend_delay * NSEC_PER_MSEC;
+ if (expires > ktime_to_ns(ktime_get()))
+ return expires; /* Expires in the future */
- out:
- return expires;
+ return 0;
}
EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration);
--
2.20.1
next reply other threads:[~2019-01-10 9:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 9:51 Ladislav Michl [this message]
2019-01-10 16:44 ` [PATCH] PM/runtime: Do not needlessly call ktime_get Tony Lindgren
2019-01-10 18:56 ` Vincent Guittot
2019-01-16 11:57 ` Rafael J. Wysocki
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