linux-kernel - [PATCH] devfreq: correctly check failed allocation

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Date:	Mon, 19 Oct 2015 14:26:49 +0000
From:	Insu Yun <wuninsu@...il.com>
To:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	changwoo@...ech.edu, Insu Yun <wuninsu@...il.com>
Subject: [PATCH] devfreq: correctly check failed allocation

Since devm_kzalloc can be failed in memory pressure,
check return value and handle error.

Signed-off-by: Insu Yun <wuninsu@...il.com>
---
 drivers/devfreq/devfreq.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index ca1b362..814089f 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -482,9 +482,23 @@ struct devfreq *devfreq_add_device(struct device *dev,
 						devfreq->profile->max_state *
 						devfreq->profile->max_state,
 						GFP_KERNEL);
+	if (!devfreq->trans_table) {
+		dev_err(dev, "%s: Unable to create transition table for the device\n",
+			__func__);
+		err = -ENOMEM;
+		goto err_dev;
+	}
+
 	devfreq->time_in_state = devm_kzalloc(dev, sizeof(unsigned int) *
 						devfreq->profile->max_state,
 						GFP_KERNEL);
+	if (!devfreq->time_in_state) {
+		dev_err(dev, "%s: Unable to create state for the device\n",
+			__func__);
+		err = -ENOMEM;
+		goto err_dev;
+	}
+
 	devfreq->last_stat_updated = jiffies;
 
 	dev_set_name(&devfreq->dev, "%s", dev_name(dev));
-- 
1.9.1

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