Commit 4e651c66 authored Jul 06, 2015 by Deepak Katragadda Committed by Gerrit - the friendly Code Review server Aug 16, 2015

soc: qcom: ssr: Check the subsystem state before initiating SSR



In the case when subsystem restart is triggered on a subsystem
which is being shutdown, there might be a race condition which
could involve the SSR framework trying to restart a subsystem
which is already shutdown. Print a warning and return from the
SSR function if this is the case.

Change-Id: I38083822db598e7b292bcf3b9e187a9f56d48bbb
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>

parent de82da07

drivers/soc/qcom/subsystem_restart.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -852,6 +852,12 @@ static void subsystem_restart_wq_func(struct work_struct *work)
		mutex_lock(&track->lock);
		do_epoch_check(dev);

		if (dev->track.state == SUBSYS_OFFLINE) {
		mutex_unlock(&track->lock);
		WARN(1, "SSR aborted: %s subsystem not online\n", desc->name);
		return;
		}

		/*
		* It's necessary to take the registration lock because the subsystem
		* list in the SoC restart order will be traversed and it shouldn't be