linux-kernel - Re: [PATCH v3 01/18] platform: delay OF device-driver matches until late

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: <CAAObsKBapFqzr+4YEXJfcJWMd+tkaBqYbGiFTntHStAP=+P-_Q@mail.gmail.com>
Date:	Fri, 7 Aug 2015 09:11:23 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Rob Herring <robherring2@...il.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>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"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" <linux-acpi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v3 01/18] platform: delay OF device-driver matches until late_initcall

On 6 August 2015 at 22:19, Rob Herring <robherring2@...il.com> wrote:
> On Thu, Aug 6, 2015 at 9:11 AM, Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote:
>> Delay matches of platform devices with OF nodes until late_initcall,
>> when we are sure that all built-in drivers have been registered already.
>> This is needed to prevent deferred probes because of some drivers not
>> having registered yet.
>>
>> The reason why only platform devices are delayed is that some other
>> devices are expected to be probed earlier than late_initcall, for
>> example, the system PNP driver needs to probe its devices in
>> fs_initcall.
>>
>> Additionally, only platform devices with OF nodes are delayed because
>> some machines may depend on oter platform devices being registered at
>> specific times.
>
> How do we know that these probes occur before the unused clocks and
> regulators are turned off? Just getting lucky (as is deferred probe)?
> Can we do this one level earlier so we have a level left to do things
> after probe.

Those are already late_initcall_sync so I guess we're fine.

Thanks,

Tomeu

> Rob
> --
> 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/
--
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/