linux-kernel - Re: [PATCH] mmc: fix mmc dma operation

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Date:   Mon, 21 Oct 2019 16:23:57 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...libre.com>
CC:     Nan Li <nan.li@...ogic.com>, Jerome Brunet <jbrunet@...libre.com>,
        <linux-amlogic@...ts.infradead.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Victor Wan <victor.wan@...ogic.com>
Subject: Re: [PATCH] mmc: fix mmc dma operation

Hi Neil,

Thanks for the review, I will update the subject and commit message in the next version.

On 2019/10/21 15:57, Neil Armstrong wrote:
> Hi,
> 
> Thanks for the fix.
> 
> First, you should add "mmc: meson-gx:" in the subject.
> 
> On 21/10/2019 07:59, Jianxin Pan wrote:
>> From: Nan Li <nan.li@...ogic.com>
>>
>> In MMC dma transfer, the region requested by dma_map_sg() may be released
>> by dma_unmap_sg() before the transfer is completed.
>>
>> Put the unmap operation in front of mmc_request_done() to avoid this.
> 
> 
> You should add a "Fixes:" tag so it can be backported on stable kernels.
> 
>>
>> Signed-off-by: Nan Li <nan.li@...ogic.com>
>> Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
>> ---
>>  drivers/mmc/host/meson-gx-mmc.c | 15 ++++++++-------
>>  1 file changed, 8 insertions(+), 7 deletions(-)
>>
[...]
>>  }
>>  
>>  static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
>>
> Neil
> 
> .
>