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nanosleep: use freezable blocking call 

Avoid waking up every thread sleeping in a nanosleep call during
suspend and resume by calling a freezable blocking call.  Previous
patches modified the freezer to avoid sending wakeups to threads
that are blocked in freezable blocking calls.

This call was selected to be converted to a freezable call because
it doesn't hold any locks or release any resources when interrupted
that might be needed by another freezing task or a kernel driver
during suspend, and is a common site where idle userspace tasks are
blocked.

Change-Id: I93383201d4dd62130cd9a9153842d303fc2e2986
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Colin Cross 2013-05-06 23:50:19 +00:00 committed by Arve Hjønnevåg
parent 5ccf7dfeea
commit 98009ee43a
1 changed files with 2 additions and 1 deletions
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3
kernel/hrtimer.c
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@ -47,6 +47,7 @@
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
#include <linux/timer.h>
#include <linux/freezer.h>
#include <asm/uaccess.h>
@ -1545,7 +1546,7 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
t->task = NULL;
if (likely(t->task))
schedule();
freezable_schedule();
hrtimer_cancel(&t->timer);
mode = HRTIMER_MODE_ABS;