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From:   Bartosz Golaszewski <brgl@bgdev.pl>
Date:   Thu, 28 Mar 2019 17:46:59 +0100
Message-ID: <CAMRc=Mfd=cj7TcMOeaSJaAG_kfs8tg2UMGUR6iTwNhT3+q3n6A@mail.gmail.com>
Subject: Re: [PATCH] gpio: mockup: fix debugfs read
To:     Linus Walleij <linus.walleij@linaro.org>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
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czw., 28 mar 2019 o 17:38 Linus Walleij <linus.walleij@linaro.org> napisa=
=C5=82(a):
>
> On Fri, Mar 22, 2019 at 6:30 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote=
:
>
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > The debugfs read callback must advance ppos or users using read() on
> > the file descriptor will never get the EOL. This wasn't spotted before
> > as I was using busybox cat for testing which uses sendfile() internally
> > and only noticed it now when switched to cat from coreutils.
> >
> > Fixes: 2a9e27408e12 ("gpio: mockup: rework debugfs interface")
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Patch applied for fixes.
> Sorry for slow application, I was in no-wifi-land for some days.
>
> Yours,
> Linus Walleij

Ugh, I was thinking about sending you a pull-request with this and a
subsequent fix this evening. Plus other fixes I have in my tree.

Bart