linux-kernel - Re: [PATCH] mm: fix NULL checking in dma_pool

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Date:	Mon, 05 Nov 2012 15:50:32 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix NULL checking in dma_pool_create()

On 11/5/12 3:37 PM, Andrew Morton wrote:
> 
> Well, the dma_pool_create() kerneldoc does not describe dev==NULL to be
> acceptable usage and given the lack of oops reports, we can assume that
> no code is calling this function with dev==NULL.
> 
> So I think we can just remove the code which handles dev==NULL?

Actually, a quick grep gives the following...

arch/arm/mach-s3c64xx/dma.c:731:	dma_pool = dma_pool_create("DMA-LLI", NULL, sizeof(struct pl080s_lli), 16, 0);
drivers/usb/gadget/amd5536udc.c:3136:	dev->data_requests = dma_pool_create("data_requests", NULL,
drivers/usb/gadget/amd5536udc.c:3148:	dev->stp_requests = dma_pool_create("setup requests", NULL,
drivers/net/wan/ixp4xx_hss.c:973:		if (!(dma_pool = dma_pool_create(DRV_NAME, NULL,
drivers/net/ethernet/xscale/ixp4xx_eth.c:1106:		if (!(dma_pool = dma_pool_create(DRV_NAME, NULL,

- xi
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