linux-kernel - RE: [PATCH 1/1] dma:

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Message-ID: <7F38996F7185A24AB9071ED4950AD8C101902E66@swsmsx413.ger.corp.intel.com>
Date:	Tue, 13 May 2008 14:04:34 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Christophe Jaillet" <christophe.jaillet@...adoo.fr>
Cc:	"linux" <linux-kernel@...r.kernel.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>
Subject: RE: [PATCH 1/1] dma: 

Christophe Jaillet wrote:
> ï»¿From: Christophe Jaillet <christophe.jaillet@...adoo.fr>
> 
> Hi, here is a patch against linux/drivers/dma/iop-adma.c which :
> 
> 1) Remove an explicit memset(.., 0, ...) to a variable allocated with
> kzalloc (i.e. 'dest').
> 
> 2) Allocate 'src' with kmalloc instead of kzalloc as all elements of the
> 'src' buffer are initialized in a 'for(...)' loop just after.
> 
> 3) remove useless 'sizeof(u8)', which always returns 1, when computing the
> size of the memory to be allocated.
> 
> 
> Note: this patch is based on 'linux-2.6.25.tar.bz2'
> 
> Signed-off-by: Christophe Jaillet <christophe.jaillet@...adoo.fr>
> 
> ---
> 
> --- linux/drivers/dma/iop-adma.c	2008-04-17 04:49:44.000000000 +0200
> +++ linux/drivers/dma/iop-adma.c.cj	2008-05-12 22:39:14.000000000 +0200
> @@ -825,10 +825,10 @@ static int __devinit iop_adma_memcpy_sel
> 
>  	dev_dbg(device->common.dev, "%s\n", __func__);
> 
> -	src = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL);
> +	src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
>  	if (!src)
>  		return -ENOMEM;
> -	dest = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL);
> +	dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
>  	if (!dest) {
>  		kfree(src);
>  		return -ENOMEM;
> @@ -838,8 +838,6 @@ static int __devinit iop_adma_memcpy_sel
>  	for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
>  		((u8 *) src)[i] = (u8)i;
> 
> -	memset(dest, 0, IOP_ADMA_TEST_SIZE);
> -
>  	/* Start copy, using first DMA channel */
>  	dma_chan = container_of(device->common.channels.next,
>  				struct dma_chan,

Acked-by: Maciej Sosnowski <maciej.sosnowski@...el.com>
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