linux-kernel - Re: [PATCH 0/4] serdev: make serdev_device

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Date:   Mon, 19 Nov 2018 09:16:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] serdev: make serdev_device_write() more usable

On Wed, Nov 14, 2018 at 9:10 AM Johan Hovold <johan@...nel.org> wrote:
>
> This series make the synchronous serdev_device_write() helper more
> usable by
>
>         1) allowing drivers to pass a zero timeout to indicate that they
>            want to wait forever;
>
>         2) returning the number of bytes actually written (buffered)
>            if the helper is interrupted;
>
>         3) make the helper use interruptible wait so that the helper can
>            be used on behalf of user space.
>
> Finally, the two write functions are documented using kernel-doc.
>
> Turns out I was using the wrong timeout for two gnss drivers that
> expected the helper to wait indefinitely. I've fixed up those separately
> (by using MAX_SCHEDULE_TIMEOUT for now), but for the helper to be usable
> when using flow control we really want it to be interruptible.
>
> Besides the two gnss drivers, there's currently only one other in-kernel
> user of this helper and that driver (rave-sp) uses a non-zero timeout
> and doesn't check the return value and therefore does not need to be
> updated.
>
> Note that this series depends on the two above mentioned GNSS fixes
> (submitted for v4.20-rc3).
>
> Johan
>
>
> Johan Hovold (4):
>   serdev: use zero to indicate infinite write timeout
>   serdev: make synchronous write return bytes written
>   serdev: make synchronous write helper interruptible
>   serdev: document the write functions using kernel-doc

Other than the one nit, for the series:

Reviewed-by: Rob Herring <robh@...nel.org>