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 16:42:55 +0800
From:	Guan Xuetao <gxt@...c.pku.edu.cn>
To:	Dan Carpenter <dan.carpenter@...cle.com>
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, 2012-03-14 at 11:19 +0300, Dan Carpenter wrote:
> 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
> 
The error return value will only generate an extra warning message, and
have no side-effect.

Thanks and Regards,
Guan Xuetao


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