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

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Message-ID: <471C029A.9050500@tiscali.nl>
Date:	Mon, 22 Oct 2007 03:53:30 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	Rik van Riel <riel@...hat.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] return hidden bug

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.
> 
---
    hidden bug returns
    
    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..ca55c33 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -365,7 +365,6 @@ 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();
 	}
 

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