linux-kernel - Re: [PATCH] ata: pata_pxa: convert not to use dma_request_slave

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Date:   Mon, 13 Nov 2023 20:14:40 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        Niklas Cassel <Niklas.Cassel@....com>
Cc:     Damien Le Moal <dlemoal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ata: pata_pxa: convert not to use
 dma_request_slave_channel()

Le 13/11/2023 à 11:17, Sergey Shtylyov a écrit :
> On 11/13/23 11:05 AM, Niklas Cassel wrote:
> [...]
>>> dma_request_slave_channel() is deprecated. dma_request_chan() should
>>> be used directly instead.
>>>
>>> Switch to the preferred function and update the error handling accordingly.
>>>
>>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>>> ---
>>>   drivers/ata/pata_pxa.c | 5 ++---
>>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
>>> index 5275c6464f57..0c9c9cf63d36 100644
>>> --- a/drivers/ata/pata_pxa.c
>>> +++ b/drivers/ata/pata_pxa.c
>>> @@ -274,9 +274,8 @@ static int pxa_ata_probe(struct platform_device *pdev)
>>>   	/*
>>>   	 * Request the DMA channel
>>>   	 */
>>> -	data->dma_chan =
>>> -		dma_request_slave_channel(&pdev->dev, "data");
>>> -	if (!data->dma_chan)
>>> +	data->dma_chan = dma_request_chan(&pdev->dev, "data");
>>
>> While the previous API could only return NULL on failure, the new API can
>> return an actual error.
>>
>> I think we should return the actual error instead of -EBUSY.
>>
>> i.e.:
>>
>> if (IS_ERR(data->dma_chan))
>> 	return PTR_ERR(data->dma_chan);
> 
>     Agreed. Christophe, please fix.

Will do.

Thx for both of you for the review.

CJ

> 
> [...]
>>> +	if (IS_ERR(data->dma_chan))
>>>   		return -EBUSY;
>>>   	ret = dmaengine_slave_config(data->dma_chan, &config);
>>>   	if (ret < 0) {
> [...]
> 
>> Kind regards,
>> Niklas
> 
> MBR, Sergey
>