linux-kernel - Re: [PATCH 1/2] mfd: rtsx: add func to split u32 into register

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Date:	Fri, 28 Nov 2014 11:54:37 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	敬锐 <micky_ching@...lsil.com.cn>
Cc:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"chris@...ntf.net" <chris@...ntf.net>,
	"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	王炜 <wei_wang@...lsil.com.cn>,
	"rogerable@...ltek.com" <rogerable@...ltek.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [PATCH 1/2] mfd: rtsx: add func to split u32 into register

On Fri, Nov 28, 2014 at 02:10:36AM +0000, 敬锐 wrote:
> eg, in sd_ops.c the cmd.arg is constructed bit by bit, we can put the right
> byte to the right register by shift, so the endian check is not need.

I looked at drivers/mmc/core/sd_ops.c and cmd.arg seems to be cpu
endian.

The new function assumes that the cpu is little endian and manually
converts it to little endian.  This is an endian bug.  I think my fix is
correct or something similar.

regards,
dan carpenter
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