linux-kernel - Re: [PATCH v3] hwmon: (aquacomputer_d5next) Add selective 200ms delay after sending ctrl report

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Message-ID: <e7bcf401-991c-808c-66df-65664940bf22@gmail.com>
Date:   Thu, 10 Aug 2023 20:15:30 +0200
From:   Aleksa Savic <savicaleksa83@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     savicaleksa83@...il.com, linux-hwmon@...r.kernel.org,
        Jack Doan <me@...kdoan.com>, Jean Delvare <jdelvare@...e.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] hwmon: (aquacomputer_d5next) Add selective 200ms delay
 after sending ctrl report

On 2023-08-10 06:09:13 GMT+02:00, Guenter Roeck wrote:
> On Mon, Aug 07, 2023 at 07:20:03PM +0200, Aleksa Savic wrote:
>> Add a 200ms delay after sending a ctrl report to Quadro,
>> Octo, D5 Next and Aquaero to give them enough time to
>> process the request and save the data to memory. Otherwise,
>> under heavier userspace loads where multiple sysfs entries
>> are usually set in quick succession, a new ctrl report could
>> be requested from the device while it's still processing the
>> previous one and fail with -EPIPE. The delay is only applied
>> if two ctrl report operations are near each other in time.
>>
>> Reported by a user on Github [1] and tested by both of us.
>>
>> [1] https://github.com/aleksamagicka/aquacomputer_d5next-hwmon/issues/82
>>
>> Fixes: 752b927951ea ("hwmon: (aquacomputer_d5next) Add support for Aquacomputer Octo")
>> Signed-off-by: Aleksa Savic <savicaleksa83@...il.com>
> 
> I would have suggested to use fsleep() to avoid unnecessary
> sleep times if they are small, bt I guess it doesn't make much
> of a difference.

Will keep that in mind.

> 
> Applied.

Will this patch perhaps be marked for stable?

Thanks,
Aleksa

> 
> Thanks,
> Guenter