linux-kernel - Re: [PATCH 2/3] i2c: stm32f7: unmap DMA mapped buffer

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Message-ID: <813dda8d-7871-46ca-bf22-4e231be4cbf1@foss.st.com>
Date: Fri, 27 Jun 2025 12:16:12 +0200
From: Clement LE GOFFIC <clement.legoffic@...s.st.com>
To: Alain Volmat <alain.volmat@...s.st.com>
CC: Pierre-Yves MORDRET <pierre-yves.mordret@...s.st.com>,
        Andi Shyti
	<andi.shyti@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Sumit Semwal
	<sumit.semwal@...aro.org>,
        Christian König
	<christian.koenig@....com>,
        M'boumba Cedric Madianga
	<cedric.madianga@...il.com>,
        Wolfram Sang <wsa@...nel.org>,
        "Pierre-Yves
 MORDRET" <pierre-yves.mordret@...com>,
        <linux-i2c@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH 2/3] i2c: stm32f7: unmap DMA mapped buffer

On 6/26/25 11:03, Alain Volmat wrote:
> Hi Clément,
> 
> thanks for the patch.
> 
> On Mon, Jun 16, 2025 at 10:53:55AM +0200, Clément Le Goffic wrote:
>> Fix an issue where the mapped DMA buffer was not unmapped.
>>
>> Fixes: 7ecc8cfde553 ("i2c: i2c-stm32f7: Add DMA support")
>> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
>> ---
>>   drivers/i2c/busses/i2c-stm32f7.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
>> index 973a3a8c6d4a..a05cac5ee9db 100644
>> --- a/drivers/i2c/busses/i2c-stm32f7.c
>> +++ b/drivers/i2c/busses/i2c-stm32f7.c
>> @@ -1622,6 +1622,8 @@ static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data)
>>   		if (i2c_dev->use_dma) {
>>   			stm32f7_i2c_disable_dma_req(i2c_dev);
>>   			dmaengine_terminate_async(dma->chan_using);
>> +			dma_unmap_single(i2c_dev->dev, dma->dma_buf, dma->dma_len,
>> +					 dma->dma_data_dir);
>>   		}
>>   		f7_msg->result = -ENXIO;
>>   	}
>> @@ -1642,6 +1644,8 @@ static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data)
>>   				dev_dbg(i2c_dev->dev, "<%s>: Timed out\n", __func__);
>>   				stm32f7_i2c_disable_dma_req(i2c_dev);
>>   				dmaengine_terminate_async(dma->chan_using);
>> +				dma_unmap_single(i2c_dev->dev, dma->dma_buf, dma->dma_len,
>> +						 dma->dma_data_dir);
>>   				f7_msg->result = -ETIMEDOUT;
>>   			}
>>   		}
>>
> 
> Sounds good to me, however there might be an additional place to fix
> within the function stm32f7_i2c_handle_isr_errs:
> Could you also take care of the unmap in the error ITs handling ?

Ack
> 
> Regards,
> Alain
> 
>> -- 
>> 2.43.0
>>