linux-kernel - Re: [PATCH 7/7] arch/unicore32/kernel/dma.c: ensure arguments to request_irq and free

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Date:	Mon, 12 Mar 2012 06:27:08 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Guan Xuetao <gxt@...c.pku.edu.cn>
cc:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] arch/unicore32/kernel/dma.c: ensure arguments to
 request_irq and free_irq are compatible

On Mon, 12 Mar 2012, Guan Xuetao wrote:

> On Sun, 2012-03-11 at 20:36 +0100, Julia Lawall wrote:
>> From: Julia Lawall <Julia.Lawall@...6.fr>
>>
>> Convert calls to free_irq so that the second argument is the same as the
>> last argument of the corresponding call to request_irq, rather than the
>> second to last.  Without this property, free_irq does nothing.
>>
>> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>>
>> ---
>>  arch/unicore32/kernel/dma.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/unicore32/kernel/dma.c b/arch/unicore32/kernel/dma.c
>> index ae441bc..c813fec 100644
>> --- a/arch/unicore32/kernel/dma.c
>> +++ b/arch/unicore32/kernel/dma.c
>> @@ -173,7 +173,7 @@ int __init puv3_init_dma(void)
>>  	ret = request_irq(IRQ_DMAERR, dma_err_handler, 0, "DMAERR", NULL);
>>  	if (ret) {
>>  		printk(KERN_CRIT "Can't register IRQ for DMAERR\n");
>> -		free_irq(IRQ_DMA, "DMA");
>> +		free_irq(IRQ_DMA, NULL);
>>  		return ret;
>>  	}
>>
> Yeah, it's an obvious mistake. Thanks.
> Because the dma device is just located inside PKUnity-3 SoC, and
> request_irq() should always return 0, I prefer to remove this free_irq()
> line.

Remove the whole if test I guess.  Is there a nce way to indicate that the 
return value is not needed (eg for the benefit of future bug finding 
rules)?

julia
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