linux-kernel - Re: [PATCH] mtd: nand: qcom: Fix the node for nand unmap resource

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Message-ID: <ff77c3ce-d635-4501-8348-5b7adff9a16c@quicinc.com>
Date:   Fri, 8 Sep 2023 15:52:39 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Bibek Kumar Patro <quic_bibekkum@...cinc.com>
CC:     <mani@...nel.org>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...cinc.com>, <quic_charante@...cinc.com>,
        <quic_kaushalk@...cinc.com>
Subject: Re: [PATCH] mtd: nand: qcom: Fix the node for nand unmap resource

On Thu, Sep 07, 2023 at 02:58:54PM +0530, Bibek Kumar Patro wrote:
> While unmapping the nand resource in case of err_core_clk
> the dev node being passed is res_start instead of nand->dma_base

It is not not dev not but addr argument.

> (where the iova returned from map operation is stored) causing
> failure in unmap operation. Hence modifying the unmap operation
> to pass the nand->base_dma instead of res_start.
> 

Pls simplify this commit description. I think, it was a simple copy/paste
mistake. I would write

"Fix addr argument to dma_unmap_resource() in the error path of probe.
The addr argument should be dma address not physical address."

> Signed-off-by: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
> ---
>  drivers/mtd/nand/raw/qcom_nandc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> index f583022755a2..e085a0f588eb 100644
> --- a/drivers/mtd/nand/raw/qcom_nandc.c
> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> @@ -3322,7 +3322,7 @@ static int qcom_nandc_probe(struct platform_device *pdev)
>  err_aon_clk:
>  	clk_disable_unprepare(nandc->core_clk);
>  err_core_clk:
> -	dma_unmap_resource(dev, res->start, resource_size(res),
> +	dma_unmap_resource(dev, nandc->base_dma, resource_size(res),
>  			   DMA_BIDIRECTIONAL, 0);
>  	dev_err(&pdev->dev, "DEBUG: probe failed for nandc module\n");
>  	return ret;

Since you are fixing a bug introduced by a previous commit, you should
add Fixes tag like below. Refer to Documentation [1].

Fixes: 7330fc505af4 ("mtd: rawnand: qcom: stop using phys_to_dma()")

[1] https://docs.kernel.org/process/submitting-patches.html#using-reported-by-tested-by-reviewed-by-suggested-by-and-fixes

Thanks,
Pavan