linux-kernel - Re: [PATCH 2/2] mmc: rtsx: Revert "mmc: rtsx: add support for pre_reqandpost

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Date:	Thu, 8 May 2014 13:54:18 +0800
From:	micky <micky_ching@...lsil.com.cn>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Chris Ball <chris@...ntf.net>, Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	<devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Roger <rogerable@...ltek.com>, Wei WANG <wei_wang@...lsil.com.cn>
Subject: Re: [PATCH 2/2] mmc: rtsx: Revert "mmc: rtsx: add support for pre_reqandpost_req"

Hi Lee

Sorry for previous email, only [PATCH 2/2] mmc: rtsx: Revert "mmc: rtsx: 
add support for pre_reqand post_req"
if need for 3.15 fix.

Best Regards.
micky.
On 04/29/2014 03:36 PM, Ulf Hansson wrote:
> On 29 April 2014 03:54,<micky_ching@...lsil.com.cn>  wrote:
>> >From: Micky Ching<micky_ching@...lsil.com.cn>
>> >
>> >This reverts commit c42deffd5b53c9e583d83c7964854ede2f12410d.
>> >
>> >commit <mmc: rtsx: add support for pre_req and post_req> did use
>> >mutex_unlock() in tasklet, but mutex_unlock() can't used in
>> >tasklet(atomic context). The driver need use mutex to avoid concurrency,
>> >so we can't use tasklet here, the patch need to be removed.
>> >
>> >The spinlock host->lock and pcr->lock may deadlock, one way to solve the
>> >deadlock is remove host->lock in sd_isr_done_transfer(), but if using
>> >workqueue the we can avoid using the spinlock and also avoid the problem.
>> >
>> >Signed-off-by: Micky Ching<micky_ching@...lsil.com.cn>
> Acked-by: Ulf Hansson<ulf.hansson@...aro.org>
>

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