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

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Message-ID: <52849ACA.1060301@asianux.com>
Date:	Thu, 14 Nov 2013 17:41:30 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Xishi Qiu <qiuxishi@...wei.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 11/14/2013 05:25 PM, Xishi Qiu wrote:
> 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.
> 

Thank you too.

James has his opinion about it, we are just discussing, welcome you
join.

:-)


Thanks.

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