linux-kernel - Re: [PATCH] return hidden bug

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Message-ID: <20071022183656.GH17536@waste.org>
Date:	Mon, 22 Oct 2007 13:36:56 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Roel Kluin <12o3l@...cali.nl>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] return hidden bug

On Sun, Oct 21, 2007 at 09:42:09PM -0400, Rik van Riel wrote:
> On Mon, 22 Oct 2007 03:05:05 +0200
> Roel Kluin <12o3l@...cali.nl> wrote:
> 
> >     return hidden bug
> >     
> >     Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> > 
> > diff --git a/arch/alpha/kernel/pci_iommu.c
> > b/arch/alpha/kernel/pci_iommu.c index e1c4707..6a69425 100644
> > --- a/arch/alpha/kernel/pci_iommu.c
> > +++ b/arch/alpha/kernel/pci_iommu.c
> > @@ -365,8 +365,8 @@ pci_unmap_single(struct pci_dev *pdev, dma_addr_t
> > dma_addr, size_t size, printk(KERN_ERR "Bogus pci_unmap_single:
> > dma_addr %lx " " base %lx size %x\n", dma_addr, arena->dma_base,
> >  		       arena->size);
> > -		return;
> >  		BUG();
> > +		return;
> >  	}
> >  
> >  	npages = calc_npages((dma_addr & ~PAGE_MASK) + size);
> 
> BUG() will terminate the process that runs into it, so you can
> just remove the return alltogether.  If BUG() is hit, the return
> will never be reached.

Looking at the printk, I don't think this particular error ought to
forcefully kill things.

-- 
Mathematics is the supreme nostalgia of our time.
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