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

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Date:   Wed, 9 Aug 2023 21:09:13 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Aleksa Savic <savicaleksa83@...il.com>
Cc:     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 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.

Applied.

Thanks,
Guenter