From: Tejun Heo <tj@kernel.org>
Date: Thu, 18 Aug 2011 08:06:53 +0000 (+0200)
Subject: apm-emulation: use wait_event_freezable() instead of freezer_[do_not_]count()
X-Git-Tag: v3.2-rc1~186^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d927c3b5a4005a2ebc5356e7e1eec436e15fa22;p=pandora-kernel.git

apm-emulation: use wait_event_freezable() instead of freezer_[do_not_]count()

vfork is moving away from freezer_[do_not_]count() one way or the
other leaving apm_ioctl() as the only user.  apm_ioctl() just wants to
wait for suspend/resume cycle to complete without hindering the
freezer.  Use wait_event_freezable() instead.

The only annoyance is that wait_event_freezable() wakes up with
-ERESTART if there are pending signals while apm_ioctl() wants to
ignore all signals until suspend is complete.  We can play with
@current->[real_]blocked but this is hardly a performance or latency
critical path - simply chill a bit on each iteration until
SUSPEND_DONE for unlikely cases where there are pending signals.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

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