linux-kernel - Re: [PATCH] [media] davinci-vpfe: Fix retcode check

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Message-ID: <20140708151110.GQ25880@mwanda>
Date:	Tue, 8 Jul 2014 18:11:10 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Levente Kurusa <lkurusa@...hat.com>
Cc:	Andrey Utkin <andrey.krieger.utkin@...il.com>,
	OSUOSL Drivers <devel@...verdev.osuosl.org>,
	Lisa Nguyen <lisa@...apiadmin.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	prabhakar.csengg@...il.com,
	Linux Media <linux-media@...r.kernel.org>,
	Archana Kumari <archanakumari959@...il.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>
Subject: Re: [PATCH] [media] davinci-vpfe: Fix retcode check

On Tue, Jul 08, 2014 at 04:32:57PM +0200, Levente Kurusa wrote:
> 2014-07-08 16:08 GMT+02:00 Andrey Utkin <andrey.krieger.utkin@...il.com>:
> > Use signed type to check correctly for negative error code. The issue
> > was reported with static analyser:
> >
> > [linux-3.13/drivers/staging/media/davinci_vpfe/dm365_ipipe_hw.c:270]:
> > (style) A pointer can not be negative so it is either pointless or an
> > error to check if it is.
> >
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=69071
> > Reported-by: David Binderman <dcb314@...mail.com>
> > Signed-off-by: Andrey Utkin <andrey.krieger.utkin@...il.com>
> 
> Hmm, while it is true that get_ipipe_mode returns an int, but
> the consequent call to regw_ip takes an u32 as its second
> argument. Did it cause a build warning for you?

It won't cause a compile warning.

> (Can't really
> check since I don't have ARM cross compilers close-by)

Make a small test program and test.

regards,
dan carpenter

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