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

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Message-ID: <CAPDyKFr6kNjfE+adx_j05wes0Y1fg=zD-AwciWy0vQdw=DbOrg@mail.gmail.com>
Date:	Mon, 28 Apr 2014 12:58:20 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Lee Jones <lee.jones@...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"

On 28 April 2014 12:53, Lee Jones <lee.jones@...aro.org> wrote:
>> 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.

Kind regards
Ulf Hansson

>
> Acked-by: Lee Jones <lee.jones@...aro.org>
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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