linux-kernel - Re: [PATCH v2 6/9] spi: spi-s3c64xx: Check return values

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Date:   Tue, 01 Sep 2020 17:21:01 +0200
From:   Lukasz Stelmach <l.stelmach@...sung.com>
To:     Sylwester Nawrocki <snawrocki@...nel.org>
Cc:     Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...nel.org>,
        linux-spi@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [PATCH v2 6/9] spi: spi-s3c64xx: Check return values

It was <2020-08-25 wto 21:06>, when Sylwester Nawrocki wrote:
> On 8/21/20 18:13, Łukasz Stelmach wrote:
>> Check return values in prepare_dma() and s3c64xx_spi_config() and
>> propagate errors upwards.
>>
>> Signed-off-by: Łukasz Stelmach<l.stelmach@...sung.com>
>> ---
>>   drivers/spi/spi-s3c64xx.c | 47 ++++++++++++++++++++++++++++++++-------
>>   1 file changed, 39 insertions(+), 8 deletions(-)
>
>> @@ -298,12 +299,24 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
>>     	desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
>>   				       dma->direction, DMA_PREP_INTERRUPT);
>> +	if (!desc) {
>> +		dev_err(&sdd->pdev->dev, "unable to prepare %s scatterlist",
>> +			dma->direction == DMA_DEV_TO_MEM ? "rx" : "tx");
>> +		return -ENOMEM;
>> +	}
>>     	desc->callback = s3c64xx_spi_dmacb;
>>   	desc->callback_param = dma;
>>     	dma->cookie = dmaengine_submit(desc);
>> +	ret = dma_submit_error(dma->cookie);
>> +	if (ret) {
>> +		dev_err(&sdd->pdev->dev, "DMA submission failed");
>> +		return -EIO;
>
> Just return the error value from dma_submit_error() here?
>

--8<---------------cut here---------------start------------->8---
static inline int dma_submit_error(dma_cookie_t cookie)
{
        return cookie < 0 ? cookie : 0;

}
--8<---------------cut here---------------end--------------->8---

Not quite meaningful IMHO, is it?

-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics

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