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

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Message-ID: <20140428122918.GG21279@lee--X1>
Date:	Mon, 28 Apr 2014 13:29:18 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	micky <micky_ching@...lsil.com.cn>, Chris Ball <chris@...ntf.net>,
	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] mmc: rtsx: Revert "mmc: rtsx: add support for pre_req
 and post_req"

> >> From: Micky Ching <micky_ching@...lsil.com.cn>
> >>
> >> This reverts commit c42deffd5b53c9e583d83c7964854ede2f12410d.
> >
> > Why was this patch even merged without an MFD Ack?
> >
> >> 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>
> >> ---
> >>  drivers/mfd/rtsx_pcr.c            |  132 ++++--------
> >>  drivers/mmc/host/rtsx_pci_sdmmc.c |  418 ++++++-------------------------------
> >>  include/linux/mfd/rtsx_common.h   |    1 -
> >>  include/linux/mfd/rtsx_pci.h      |    6 -
> >>  4 files changed, 109 insertions(+), 448 deletions(-)
> >
> > This patch should be sent to the -rcs as soon as possible:
> 
> Do you mind helping out doing it here Lee? Not sure how busy Chris is
> at the moment.

I don't mind. I just need a maintainer Ack from one of you guys.

> >
> > Acked-by: Lee Jones <lee.jones@...aro.org>

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