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

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Date:	Wed, 14 Mar 2012 11:19:10 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Guan Xuetao <gxt@...c.pku.edu.cn>
Cc:	Julia Lawall <julia.lawall@...6.fr>,
	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 Wed, Mar 14, 2012 at 04:07:24PM +0800, Guan Xuetao wrote:
> puv3_init_dma() is called ONCE when initializing.
> In logical, if request_irq(IRQ_DMAERR, *) failed, free_irq(IRQ_DMA, *)
> is unnecessary, and dma device/driver can keep on working.
> The patch could be:
>   	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");
>   		return ret;
>   	}

It seems like you should remove the error return as well?

regards,
dan carpenter


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