linux-kernel - Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

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Message-ID: <CAMuHMdXtL=-JWiXNbpwBEc+oMAVpBq1ShqZhFVKZRO_x9Xq4tA@mail.gmail.com>
Date:	Wed, 29 Apr 2015 20:56:26 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Mark Brown <broonie@...nel.org>,
	"Eric D." <eric.dillmann@...il.com>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Jonathan Corbet <corbet@....net>,
	Hans de Goede <hdegoede@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-spi <linux-spi@...r.kernel.org>,
	Martin Sperl <kernel@...tin.sperl.org>
Subject: Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

On Wed, Apr 29, 2015 at 8:37 PM, Michal Suchanek <hramrach@...il.com> wrote:
> I am using a version of Maxime's patch myself right now. It does not
> seem it's going to be include in the kernel any time soon, however.
>
> FWIW I added the ability to open any CS, even those claimed by kernel
> drivers. This addresses any potential race of spidev binding before
> the actual driver but has the potential to introduce some subtle bugs
> when you open and reconfigure a CS used by a kernel driver or send
> some commands that upset the device.

Uh, that sounds dangerous.

Perhaps you can add some safety net, before user space can access
them, cfr. /sys/class/gpio/export?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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