From: Sebastian Capella <sebastian.capella@linaro.org>
Date: Wed, 19 Feb 2014 01:52:08 +0000 (-0800)
Subject: PM / hibernate: Fix restore hang in freeze_processes()
X-Git-Tag: v3.14-rc5~9^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d;p=pandora-kernel.git

PM / hibernate: Fix restore hang in freeze_processes()

During restore, pm_notifier chain are called with
PM_RESTORE_PREPARE.  The firmware_class driver handler
fw_pm_notify does not have a handler for this.  As a result,
it keeps a reader on the kmod.c umhelper_sem.  During
freeze_processes, the call to __usermodehelper_disable tries to
take a write lock on this semaphore and hangs waiting.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Ming Lei <ming.lei@canonical.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

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