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

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Date:	Thu, 8 May 2014 08:53:57 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Chris Ball <chris@...ntf.net>, micky <micky_ching@...lsil.com.cn>,
	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_req and post_req"

> >> 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>
> 
> Hi Lee,
> 
> Would you mind to pick this up and send it for 3.15 fixes?
> 
> The other revert "[PATCH 1/2] mmc: rtsx: Revert "mmc: rtsx: modify
> error handle and remove smatch warnings", needs to go through the mmc
> tree.

Sent.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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