linux-kernel - Re: [PATCH v3] dmaengine: ti: k3-udma: Deferring probe when soc_device

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Date:   Thu, 29 Dec 2022 18:29:27 +0200
From:   Péter Ujfalusi <peter.ujfalusi@...il.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Nicolas Frayer <nfrayer@...libre.com>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        khilman@...libre.com, glaroque@...libre.com
Subject: Re: [PATCH v3] dmaengine: ti: k3-udma: Deferring probe when
 soc_device_match() returns NULL



On 28/12/2022 13:16, Vinod Koul wrote:
> On 17-11-22, 19:44, Nicolas Frayer wrote:
>> When the k3 socinfo driver is built as a module, there is a possibility
>> that it will probe after the k3 udma driver and the later returns -ENODEV.
>> By deferring the k3 udma probe we allow the k3 socinfo to probe and
>> register the soc_device_attribute structure needed by the k3 udma driver.
>> Removed the dev_err() message as well as it's deferring and not failing.
> 
> lgtm, but need rebase as I already picked commit 3f58e10615f3 dmaengine: ti:
> k3-udma: Add support for BCDMA CSI RX

Is this path needed at all? afaik the k3 socinfo is not going to be 
module built.

> 
>>
>> Signed-off-by: Nicolas Frayer <nfrayer@...libre.com>
>> ---
>> v1->v2:
>> Extracted this patch from the following series:
>> https://lore.kernel.org/all/20221108181144.433087-1-nfrayer@baylibre.com/
>>
>> v2->v3:
>> Removed the dev_err() message
>>
>>   drivers/dma/ti/k3-udma.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
>> index ce8b80bb34d7..ca1512eb9910 100644
>> --- a/drivers/dma/ti/k3-udma.c
>> +++ b/drivers/dma/ti/k3-udma.c
>> @@ -5271,10 +5271,10 @@ static int udma_probe(struct platform_device *pdev)
>>   	ud->match_data = match->data;
>>   
>>   	soc = soc_device_match(k3_soc_devices);
>> -	if (!soc) {
>> -		dev_err(dev, "No compatible SoC found\n");
>> -		return -ENODEV;
>> -	}
>> +
>> +	if (!soc)
>> +		return -EPROBE_DEFER;
>> +
>>   	ud->soc_data = soc->data;
>>   
>>   	ret = udma_get_mmrs(pdev, ud);
>> -- 
>> 2.25.1
> 

-- 
Péter