Commit c511851d authored Oct 29, 2013 by Rafael J. Wysocki

Revert "epoll: use freezable blocking call"

This reverts commit 1c441e92 (epoll: use freezable blocking call)
which is reported to cause user space memory corruption to happen
after suspend to RAM.

Since it appears to be extremely difficult to root cause this
problem, it is best to revert the offending commit and try to address
the original issue in a better way later.

References: https://bugzilla.kernel.org/show_bug.cgi?id=61781


Reported-by: Natrio <natrio@list.ru>
Reported-by: Jeff Pohlmeyer <yetanothergeek@gmail.com>
Bisected-by: Leo Wolf <jclw@ymail.com>
Fixes: 1c441e92 (epoll: use freezable blocking call)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 3.11+ <stable@vger.kernel.org> # 3.11+

parent 959f5854

fs/eventpoll.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -34,7 +34,6 @@
		#include <linux/mutex.h>
		#include <linux/anon_inodes.h>
		#include <linux/device.h>
		#include <linux/freezer.h>
		#include <asm/uaccess.h>
		#include <asm/io.h>
		#include <asm/mman.h>
		@@ -1605,8 +1604,7 @@ fetch_events:
		}

		spin_unlock_irqrestore(&ep->lock, flags);
		if (!freezable_schedule_hrtimeout_range(to, slack,
		HRTIMER_MODE_ABS))
		if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS))
		timed_out = 1;

		spin_lock_irqsave(&ep->lock, flags);

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