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Thu, 30 Sep 2021 12:36:53 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas1p3.samsung.com (KnoxPortal) with ESMTPA id 20210930033653epcas1p34537f75ad56be624c9b9aa3b66186c4c~pfE2yQs-j3149231492epcas1p37; Thu, 30 Sep 2021 03:36:53 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20210930033653epsmtrp229051498b39aa6bc9af23c209f8bcc99~pfE2xIGJT1081410814epsmtrp2W; Thu, 30 Sep 2021 03:36:53 +0000 (GMT) X-AuditID: b6c32a39-227ff70000003640-59-615530d5aacb Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 55.20.08750.4D035516; Thu, 30 Sep 2021 12:36:52 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20210930033652epsmtip1969926569f975b4587601f5e5c5b745a~pfE2bjQr-2345623456epsmtip1b; Thu, 30 Sep 2021 03:36:52 +0000 (GMT) Subject: Re: [PATCH 01/10] PM / devfreq: strengthen check for freq_table To: Samuel Holland , MyungJoo Ham , Kyungmin Park , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , Rob Herring Cc: Michael Turquette , Stephen Boyd , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org From: Chanwoo Choi Organization: Samsung Electronics Message-ID: <4c306d89-836f-a8d3-90ec-ed22641d0e48@samsung.com> Date: Thu, 30 Sep 2021 12:58:08 +0900 User-Agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/29/21 1:42 PM, Samuel Holland wrote: > Since commit ea572f816032 ("PM / devfreq: Change return type of > devfreq_set_freq_table()"), all devfreq devices are expected to have a > valid freq_table. The devfreq core unconditionally dereferences > freq_table in the sysfs code and in get_freq_range(). > > Therefore, we need to ensure that freq_table is both non-null and > non-empty (length is > 0). If either check fails, replace the table > using set_freq_table() or return the error. > > Signed-off-by: Samuel Holland > --- > drivers/devfreq/devfreq.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index 28f3e0ba6cdd..7a8b022ba456 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -827,7 +827,7 @@ struct devfreq *devfreq_add_device(struct device *dev, > goto err_dev; > } > > - if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { > + if (!devfreq->profile->max_state || !devfreq->profile->freq_table) { > mutex_unlock(&devfreq->lock); > err = set_freq_table(devfreq); > if (err < 0) > Applied it. Thanks. -- Best Regards, Chanwoo Choi Samsung Electronics _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel