linux-kernel - Re: pci/pcie/aer/aerdrv_acpi.c: inconsequent NULL checking

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Message-ID: <20080220075628.GD31955@cs181133002.pp.htv.fi>
Date:	Wed, 20 Feb 2008 09:56:28 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Greg KH <greg@...ah.com>
Cc:	Andrew Patterson <andrew.patterson@...com>,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: pci/pcie/aer/aerdrv_acpi.c: inconsequent NULL checking

On Tue, Feb 19, 2008 at 09:47:58PM -0800, Greg KH wrote:
> On Tue, Feb 19, 2008 at 09:29:02PM +0200, Adrian Bunk wrote:
> > The Coverity checker spotted the following inconsequent NULL checking 
> > introduced by commit 3c75e23784e6ed5f4841de43d0750fd9b37bafcb:
> > 
> > <--  snip  -->
> > 
> > ...
> > int aer_osc_setup(struct pcie_device *pciedev)
> > {
> > ...            vvvvvvvvv
> >         while (pdev->bus && pdev->bus->self)
> >                 pdev = pdev->bus->self;
> 
> That could probably change to just pdev->bus->self, as a bus should
> always be there for a pdev, so I don't see this as a problem.

I'm not claiming this specific case was a problem.

When a NULL check is only performed in some cases that's sometimes a bug 
that has to be fixed and in most cases a not required check that should 
be removed at some point in time.

> thanks,
> 
> greg k-h

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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