linux-kernel - [PATCH v2 4/4] cpuidle-haltpoll: do not set an owner to allow modunload

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Date:   Tue,  3 Sep 2019 14:24:44 +0100
From:   Joao Martins <joao.m.martins@...cle.com>
To:     linux-pm@...r.kernel.org
Cc:     Joao Martins <joao.m.martins@...cle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-kernel@...r.kernel.org,
        Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org
Subject: [PATCH v2 4/4] cpuidle-haltpoll: do not set an owner to allow modunload

cpuidle-haltpoll can be built as a module to allow optional late load.
Given we are setting @owner to THIS_MODULE, cpuidle will attempt to grab a
module reference every time a cpuidle_device is registered -- so
essentially all online cpus get a reference.

This prevents for the module to be unloaded later, which makes the
module_exit callback entirely unused. Thus remove the @owner and allow
module to be unloaded.

Fixes: fa86ee90eb11 ("add cpuidle-haltpoll driver")
Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
---
v2:
* Add missing Fixes tag
---
 drivers/cpuidle/cpuidle-haltpoll.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c
index 7a0239ef717e..49a65c6fe91e 100644
--- a/drivers/cpuidle/cpuidle-haltpoll.c
+++ b/drivers/cpuidle/cpuidle-haltpoll.c
@@ -35,7 +35,6 @@ static int default_enter_idle(struct cpuidle_device *dev,
 static struct cpuidle_driver haltpoll_driver = {
 	.name = "haltpoll",
 	.governor = "haltpoll",
-	.owner = THIS_MODULE,
 	.states = {
 		{ /* entry 0 is for polling */ },
 		{
-- 
2.17.1