linux-kernel - Re: [PATCH v2 3/5] hwmon: (sch5627) Use regmap for pwm map register caching

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Message-ID: <3b05ef1a-296a-4cf9-a376-ee966729165f@roeck-us.net>
Date:   Sun, 10 Sep 2023 17:52:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Armin Wolf <W_Armin@....de>
Cc:     hdegoede@...hat.com, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] hwmon: (sch5627) Use regmap for pwm map register
 caching

On Thu, Sep 07, 2023 at 07:26:37AM +0200, Armin Wolf wrote:
> Accessing virtual registers is very inefficient, so pwm map values
> should be cached when possible, else userspace could effectively do
> a DOS attack by reading pwm map values in a while loop.
> Use the regmap cache to cache those values.
> 
> Tested on a Fujitsu Esprimo P720.
> 
> Signed-off-by: Armin Wolf <W_Armin@....de>

Applied.

Thanks,
Guenter