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

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Message-ID: <20080220160935.GA2658@kroah.com>
Date:	Wed, 20 Feb 2008 08:09:35 -0800
From:	Greg KH <greg@...ah.com>
To:	Adrian Bunk <bunk@...nel.org>
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 Wed, Feb 20, 2008 at 09:56:28AM +0200, Adrian Bunk wrote:
> 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.

Well, Coverity did :)

> 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.

I agree, patches are always welcome...

thanks,

greg k-h
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