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Commit 0c39a6a6 authored by Colin Cross's avatar Colin Cross Committed by Alistair Strachan
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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.

Bug: 77139736
Bug: 120440023
Change-Id: I848d08d28c89302fd42bbbdfa76489a474ab27bf
[ccross: This was upstream (https://lkml.org/lkml/2013/5/6/823), but
         reverted because it reportedly caused memory corruption on
         32-bit x86 (https://patchwork.kernel.org/patch/3162301/).

]
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 d8572161
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