linux-kernel - Re: [PATCH] gpio: mockup: fix debugfs read

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Date:   Thu, 28 Mar 2019 17:55:55 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH] gpio: mockup: fix debugfs read

On Thu, Mar 28, 2019 at 5:47 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> czw., 28 mar 2019 o 17:38 Linus Walleij <linus.walleij@...aro.org> napisał(a):
> > On Fri, Mar 22, 2019 at 6:30 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > > From: Bartosz Golaszewski <bgolaszewski@...libre.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@...libre.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.

Oh if it is easier for you do that, and I will drop this patch and just
merge your PR as it arrives.

Yours,
Linus Walleij