linux-kernel - Re: [PATCH] arch: metag: kernel: dma.c: check 'pud' whether is NULL in dma_alloc

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Date:	Thu, 14 Nov 2013 17:25:26 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	James Hogan <james.hogan@...tec.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-metag@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch: metag: kernel: dma.c: check 'pud' whether is NULL
 in dma_alloc_init()

On 2013/11/14 16:11, Chen Gang wrote:

> Like another p?d_alloc(), pud_alloc() also may fail, so need check it.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  arch/metag/kernel/dma.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
> index db589ad..e6cf39b 100644
> --- a/arch/metag/kernel/dma.c
> +++ b/arch/metag/kernel/dma.c
> @@ -398,6 +398,11 @@ static int __init dma_alloc_init(void)
>  		int offset = pgd_index(CONSISTENT_START);
>  		pgd = pgd_offset(&init_mm, CONSISTENT_START);
>  		pud = pud_alloc(&init_mm, pgd, CONSISTENT_START);
> +		if (!pud) {
> +			pr_err("%s: no pud tables\n", __func__);
> +			ret = -ENOMEM;
> +			break;
> +		}

It looks fine to me.

Thanks,
Xishi Qiu

>  		pmd = pmd_alloc(&init_mm, pud, CONSISTENT_START);
>  		if (!pmd) {
>  			pr_err("%s: no pmd tables\n", __func__);


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