linux-kernel - [BACKPORT 4.14.y 6/8] sched/cpufreq/schedutil: Fix error path mutex unlock

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Date:   Fri, 22 Mar 2019 17:17:21 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     stable@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jules Maselbas <jules.maselbas@....com>,
        Chris Redpath <chris.redpath@....com>,
        Dietmar Eggermann <dietmar.eggemann@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Galbraith <efault@....de>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Stephen Kyle <stephen.kyle@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, nd@....com,
        Ingo Molnar <mingo@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [BACKPORT 4.14.y 6/8] sched/cpufreq/schedutil: Fix error path mutex unlock

From: Jules Maselbas <jules.maselbas@....com>

This patch prevents the 'global_tunables_lock' mutex from being
unlocked before being locked.  This mutex is not locked if the
sugov_kthread_create() function fails.

Signed-off-by: Jules Maselbas <jules.maselbas@....com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Cc: Chris Redpath <chris.redpath@....com>
Cc: Dietmar Eggermann <dietmar.eggemann@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Patrick Bellasi <patrick.bellasi@....com>
Cc: Stephen Kyle <stephen.kyle@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Cc: nd@....com
Link: http://lkml.kernel.org/r/20180329144301.38419-1-jules.maselbas@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
(cherry picked from commit 1b5d43cfb69759d8ef8d30469cea31d0c037aed5)
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/sched/cpufreq_schedutil.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 81eb7899c7c8..b314c9eaa71d 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -605,10 +605,9 @@ static int sugov_init(struct cpufreq_policy *policy)
 
 stop_kthread:
 	sugov_kthread_stop(sg_policy);
-
-free_sg_policy:
 	mutex_unlock(&global_tunables_lock);
 
+free_sg_policy:
 	sugov_policy_free(sg_policy);
 
 disable_fast_switch:
-- 
2.20.0