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

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Message-ID: <8cdf46d5-62a9-40da-8db4-e888bfd5c8f3@quicinc.com>
Date:   Mon, 11 Sep 2023 19:07:04 +0530
From:   Bibek Kumar Patro <quic_bibekkum@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...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 9/8/2023 3:52 PM, Pavan Kondeti wrote:
> 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."
> 

Thanks for this suggestion Pavan, this looks simplified and easier to
understand the bug. Incorporated this in next revision.

>> 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 very much for the inputs, addressed this in next revision.

Thanks & regards,
Bibek

> 
> Thanks,
> Pavan