linux-kernel - Re: [PATCH v1] Revert "dmaengine: stm32-mdma: Add a check on read_u32

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Message-ID: <20190325152552.GQ5348@vkoul-mobl>
Date:   Mon, 25 Mar 2019 20:55:52 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Yves MORDRET <pierre-yves.mordret@...com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        dmaengine@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] Revert "dmaengine: stm32-mdma: Add a check on
 read_u32_array"

On 25-03-19, 15:46, Pierre-Yves MORDRET wrote:

Please use the right subsystem name dmaengine, revert is not a subsystem
name!

> This reverts commit 906b40b246b0acb54c4dc97e815cf734761c9820.

This should use the cannonical form for commits commit-sha1: ("title....") 
> 
> As stated by bindings "st,ahb-addr-masks" is optional.
> The statement inserted by this commit makes this property
> mandatory and prevents MDMA to be probed in case property not present.
> 
> Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>
> ---
>  drivers/dma/stm32-mdma.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
> index 4e0eede..ac0301b 100644
> --- a/drivers/dma/stm32-mdma.c
> +++ b/drivers/dma/stm32-mdma.c
> @@ -1578,11 +1578,9 @@ static int stm32_mdma_probe(struct platform_device *pdev)
>  
>  	dmadev->nr_channels = nr_channels;
>  	dmadev->nr_requests = nr_requests;
> -	ret = device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
> +	device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
>  				       dmadev->ahb_addr_masks,
>  				       count);
> -	if (ret)
> -		return ret;
>  	dmadev->nr_ahb_addr_masks = count;

so if st,ahb-addr-masks is not present what value does count contain?

>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -- 
> 2.7.4

-- 
~Vinod