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

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Date:	Mon, 28 Apr 2014 11:53:50 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	micky_ching@...lsil.com.cn
Cc:	chris@...ntf.net, ulf.hansson@...aro.org, sameo@...ux.intel.com,
	gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, rogerable@...ltek.com,
	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:

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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