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Message-ID: <819323f6-3b2e-403b-3068-06d4c09af354@gmail.com>
Date: Wed, 10 Mar 2021 01:02:25 +0900
From: Chanwoo Choi <cwchoi00@...il.com>
To: Dong Aisheng <aisheng.dong@....com>, linux-pm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Cc: dongas86@...il.com, kernel@...gutronix.de, shawnguo@...nel.org,
linux-imx@....com, linux-kernel@...r.kernel.org,
myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
cw00.choi@...sung.com, abel.vesa@....com
Subject: Re: [PATCH 08/11] PM / devfreq: check get_dev_status in
devfreq_update_stats
On 21. 3. 9. 오후 9:58, Dong Aisheng wrote:
> Check .get_dev_status() in devfreq_update_stats in case it's abused
> when a device does not provide it.
>
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> ---
> drivers/devfreq/governor.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
> index 31af6d072a10..67a6dbdd5d23 100644
> --- a/drivers/devfreq/governor.h
> +++ b/drivers/devfreq/governor.h
> @@ -89,6 +89,9 @@ int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
>
> static inline int devfreq_update_stats(struct devfreq *df)
> {
> + if (!df->profile->get_dev_status)
> + return -EINVAL;
> +
> return df->profile->get_dev_status(df->dev.parent, &df->last_status);
> }
> #endif /* _GOVERNOR_H */
>
Applied it. Thanks.
--
Best Regards,
Samsung Electronics
Chanwoo Choi
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