linux-kernel - Re: [RESEND PATCH v2 1/4] dmaengine: pl330: Remove non-NULL check for pl330_submit

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Message-ID: <543D19A9.5010109@metafoo.de>
Date:	Tue, 14 Oct 2014 14:40:09 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Vinod Koul <vinod.koul@...el.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
CC:	Dan Williams <dan.j.williams@...el.com>,
	Michal Simek <michal.simek@...inx.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RESEND PATCH v2 1/4] dmaengine: pl330: Remove non-NULL check
 for pl330_submit_req parameters

On 10/14/2014 01:51 PM, Vinod Koul wrote:
> On Mon, Sep 29, 2014 at 02:42:18PM +0200, Krzysztof Kozlowski wrote:
>> The pl330_submit_req() checked supplied 'struct pl330_thread thrd' and
>> 'struct dma_pl330_desc desc' parameters for non-NULL. However these
>> checks are useless because supplied arguments won't be NULL.
> even if we have some error or bug?
>
> I would like this to be checked and complained loudly so we know something
> is going wrong rather than assuming it will be correct always.
>

In this case it is impossible to get to this code portion if the pointer is 
NULL because it would have crashed earlier.

- Lars
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