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Commit a1f9edc9 authored by Colin Cross's avatar Colin Cross Committed by Amit Pundir
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ANDROID: fs: epoll: use freezable blocking call 



Avoid waking up every thread sleeping in an epoll_wait 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: I848d08d28c89302fd42bbbdfa76489a474ab27bf
Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarColin Cross <ccross@android.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent dd47f951

fs/eventpoll.c

+3 −1
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
#include <linux/mutex.h>

#include <linux/anon_inodes.h>

#include <linux/device.h>

#include <linux/freezer.h>

#include <linux/uaccess.h>

#include <asm/io.h>

#include <asm/mman.h>
@@ -1816,7 +1817,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events, 
			}



			spin_unlock_irq(&ep->wq.lock);

			if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS))

			if (!freezable_schedule_hrtimeout_range(to, slack,

								HRTIMER_MODE_ABS))

				timed_out = 1;



			spin_lock_irq(&ep->wq.lock);