linux-kernel - Re: [PATCH v6 03/22] of/platform: Point to struct device from device node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3956941.s3nuWak5tq@vostro.rjw.lan>
Date:	Tue, 27 Oct 2015 16:43:53 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-acpi@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 03/22] of/platform: Point to struct device from device node

On Tuesday, October 27, 2015 03:48:40 PM Tomeu Vizoso wrote:
> On 24 October 2015 at 15:57, Rafael J. Wysocki <rjw@...ysocki.net> wrote:

[...]

> >
> > Well, once that has happened, your new device pointer in the given device_node
> > becomes useless.  Why exactly is that fine?
> 
> Why do you think it's useless? It's the device that was registered
> from that device_node. The other one just happens to want to point to
> the same device_node for whatever other reason, but I don't see how is
> that relevant.

It is useless as a reverse mapping from OF nodes to devices.  It tells us
which device pointing to the given device node has been found first, but
that's just it.

You can't say whether or not it is special in any way with respect to the
other devices hanging out of the same OF node unless you have some additional
information on how those devices are related to each other.

Thanks,
Rafael

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/