linux-kernel - Re: [PATCH 5/5] switchtec: MRPC DMA mode implementation

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Date:   Thu, 13 Dec 2018 09:46:13 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Wesley Sheng <wesley.sheng@...rochip.com>
Cc:     kurt.schwemmer@...rosemi.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, wesleyshenggit@...a.com
Subject: Re: [PATCH 5/5] switchtec: MRPC DMA mode implementation



On 2018-12-13 8:17 a.m., Bjorn Helgaas wrote:
>>  static void init_pff(struct switchtec_dev *stdev)
>> @@ -1294,6 +1367,19 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
>>  
>>  	pci_set_drvdata(pdev, stdev);
>>  
>> +	if (!use_dma_mrpc)
>> +		return 0;
>> +
>> +	if (!(ioread32(&stdev->mmio_mrpc->dma_ver) ? true : false))
>> +		return 0;
> 
> This is ... harder to decode than necessary.  It's obvious that the
> intent is to return if the adapter firmware doesn't support DMA, but I
> lost interest before I could verify that it works as intended.

Oh, ick, yes. I must have missed that in my review.

@Wesley, that would definitely be something worth cleaning up. That
ternary operator doesn't make any sense.

Thanks, Bjorn, for the review and picking up the series.

Logan