linux-kernel - Re: [PATCH v2] irqchip: mediatek: Use IS

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Date:	Wed, 10 Dec 2014 21:08:05 +0100
From:	Beniamino Galvani <b.galvani@...il.com>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>,
	srv_heupstream@...iatek.com, hc.yen@...iatek.com,
	yh.chen@...iatek.com, linux-kernel@...r.kernel.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	nathan.chung@...iatek.com, Sascha Hauer <kernel@...gutronix.de>,
	eddie.huang@...iatek.com, yingjoe.chen@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] irqchip: mediatek: Use IS_ERR() instead of NULL
 pointer check

On Wed, Dec 10, 2014 at 07:53:13AM -0500, Jason Cooper wrote:
> On Wed, Dec 10, 2014 at 01:14:43PM +0100, Beniamino Galvani wrote:
> > On Wed, Dec 10, 2014 at 05:55:02PM +0800, Yingjoe Chen wrote:
> > > Beniamino reported a kernel oops caused by an invalid DT file for the
> > > mediatek interrupt polarity extension.
> > > 
> > > The reason is that the interrupt polarity support for mediatek chips
> > > merely checks for NULL pointer instead of a casted error return
> > > value in mtk_sysirq_of_init() so any other casted error value passes
> > > the NULL pointer check and causes a kernel panic when dereferenced.
> > > 
> > > Use IS_ERR() and return the error value via PTR_ERR().
> > > 
> > > Reported-and-tested-by: Beniamino Galvani <b.galvani@...il.com>
> > 
> > Well, actually I only reported the bug and didn't do any test. Can the
> > "-and-tested" portion of the tag be dropped while applying the patch?
> 
> I'd prefer that it be tested before applying.  Would you mind confirming
> that the oops is gone with this patch applied?

Probably the commit message is misleading about this, but I don't own
any Mediatek device and never used the driver. I only reported [1] a
possible bug in the driver found through code analysis.

Anyway, I suppose that the tests done by Yingjoe are enough to get the
patch merged.

Beniamino

[1] https://lkml.org/lkml/2014/11/29/105
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