linux-kernel - Re: [PATCH 6/7] spi/mpc8xxx: don't check platform_get

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: <20091216193745.GA20429@oksana.dev.rtsoft.ru>
Date:	Wed, 16 Dec 2009 22:37:45 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, David Vrabel <david.vrabel@....com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kumar Gala <galak@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	spi-devel-general@...ts.sourceforge.net,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 6/7] spi/mpc8xxx: don't check platform_get_irq's return
 value against zero

On Wed, Dec 16, 2009 at 08:18:39PM +0100, Uwe Kleine-König wrote:
[...]
> > > I'm a bit annoyed as this is the third time[1] this month this irq0
> > > discussion pops up for me.  I think people see that irq0 is involved
> > > somehow, start wailing and stop seeing the issues being fixed.
> > 
> > For this particular driver, there is NO issue whatsoever. It is
> > only used for PowerPC, which has VIRQ0 == invalid IRQ. And note
> > that there still could be HWIRQ0 on PowerPC, but it is *never*
> > mapped to VIRQ0.
> Yes, there is an issue.  If the platform device doesn't have a resource
> specifing the irq, platform_get_irq returns -ENXIO.  So in the driver
> (unsigned)(-ENXIO) is passed to mpc8xxx_spi_probe as (!(-ENXIO)) is
> false and so the error isn't catched.

If you look into how we create the platform device, you'll notice
that -ENXIO isn't possible.
It's in arch/powerpc/platforms/83xx/mpc832x_rdb.c:of_fsl_spi_probe(),
which is a legacy interface that I'd like to be removed anyway.

Though, if you want to fix the inconsistency in the platform device
API, then I'd suggest to fix the platform_get_irq(). The driver itself
is correct.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
--
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/