linux-kernel - Re: [PATCH] arch/avr32: Fix build failure for avr32 caused by typo

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Date:	Mon, 28 Dec 2009 11:02:44 +0100
From:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
To:	Peter Hüwe <PeterHuewe@....de>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Ma <pma@...iamatech.com>, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH] arch/avr32: Fix build failure for avr32 caused by typo

On Mon, 28 Dec 2009 10:59:30 +0100
Peter Hüwe <PeterHuewe@....de> wrote:

> Am Montag 28 Dezember 2009 09:13:18 schrieb Hans-Christian Egtvedt:
> > On Fri, 25 Dec 2009 20:08:45 +0100
> > 
> > Peter Huewe <PeterHuewe@....de> wrote:
> > > This patch fixes a build failure introduced by the patch
> > >   atmel-mci: change use of dma slave interface by Nicolas Ferre
> > > by changing mci_dma_slave to the correct name of mci_dma_data
> > >
> > > This should make the avr32 tree build again.
> > 
> > Ah, great, I have not gotten around to test this yet. Thanks for the
> > patch. I've done some minor changes and also fixed the kzalloc/kfree
> > error handling. Please see the inlined patch below.
> > 
> 
> > @@ -1344,7 +1344,7 @@ at32_add_device_mci(unsigned int id, struct
> >  mci_platform_data *data) ARRAY_SIZE(atmel_mci0_resource)))
> >  		goto fail;
> > 
> > -	slave = kzalloc(sizeof(struct mci_dma_slave), GFP_KERNEL);
> > +	slave = kzalloc(sizeof(struct mci_dma_data), GFP_KERNEL);
> > 
> >  	slave->sdata.dma_dev = &dw_dmac0_device.dev;
> >  	slave->sdata.reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
> 
> 
> Great, thanks for the update.
> The only thing that still catches my eye is that the kzalloc line can fail, so 
> you should perhaps add something like
> if (!slave) {
> 	printk(KERN_ERR "No memory left for at32ap700x: at32_add_device_mc");
> 	goto fail;
> }
> 

Sounds like the patch should be split in two, one addressing the proper
naming of the struct mci_dma_data and one fixing the allocation of
memory and proper cleanup.

-- 
Best regards,
Hans-Christian Egtvedt
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