From: Leonard Crestez <leonard.crestez@nxp.com>
To: Matthias Kaehlcke <mka@chromium.org>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>
Cc: "Artur Świgoń" <a.swigon@partner.samsung.com>,
linux-pm@vger.kernel.org, "Krzysztof Kozlowski" <krzk@kernel.org>,
"Lukasz Luba" <l.luba@partner.samsung.com>,
"Chanwoo Choi" <cw00.choi@samsung.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] PM / devfreq: Check NULL governor in available_governors_show
Date: Mon, 23 Sep 2019 19:34:43 +0300 [thread overview]
Message-ID: <96f459015e6418cee4fa20fdbdb80c4caf417c19.1569256298.git.leonard.crestez@nxp.com> (raw)
The governor is initialized after sysfs attributes become visible so in
theory the governor field can be NULL here.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
drivers/devfreq/devfreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Found this by hacking device core to call attribute "show" functions
from inside device_add.
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 00fc23fea5b2..896fb2312f2f 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1322,11 +1322,11 @@ static ssize_t available_governors_show(struct device *d,
/*
* The devfreq with immutable governor (e.g., passive) shows
* only own governor.
*/
- if (df->governor->immutable) {
+ if (df->governor && df->governor->immutable) {
count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
"%s ", df->governor_name);
/*
* The devfreq device shows the registered governor except for
* immutable governors such as passive governor .
--
2.17.1
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next reply other threads:[~2019-09-23 16:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20190923163453epcas4p1f9cff7d9f1a33fabcf4c980560d6c27d@epcas4p1.samsung.com>
2019-09-23 16:34 ` Leonard Crestez [this message]
2019-09-23 18:50 ` [PATCH] PM / devfreq: Check NULL governor in available_governors_show Matthias Kaehlcke
2019-09-24 1:52 ` Chanwoo Choi
2019-09-24 7:17 ` Leonard Crestez
2019-09-24 7:25 ` Chanwoo Choi
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