linux-kernel - Re: [PATCH 06/14] mfd: Initialise the DB8500 PRCMU driver at core

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]

Date:	Tue, 12 Jun 2012 12:59:38 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	grant.likely@...retlab.ca, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linus.walleij@...ricsson.com,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 06/14] mfd: Initialise the DB8500 PRCMU driver at core_initcall time

On Tuesday 12 June 2012, Lee Jones wrote:
> On 11/06/12 22:01, Linus Walleij wrote:
> > Hm what shall we do when we run out of initlevels? I think this was the
> > kind of thing that deferred probe should solve. Usually changing this kind
> > of thing has side effects so I'm a bit hesitant.
> 
> Ah yes, I remember now. The IRQ domain needs to be in place before the 
> Device Tree is parsed by the Open Firmware subsystem. If it's not the 
> error "no irq domain found" is triggered and the IRQs are never mapped.
> 
> I'd be happy to take a second opinion, but I believe this (and the other 
> core_initcall patch) is required.

It's still just a hack. The real solution that we discussed last time it
came up is to defer the translation of irq numbers until device driver
probe time, and bail out with -EPROBE_DEFER if you try to use a device
whose interrupt is not available yet.

	Arnd
--
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/