linux-kernel - Re: [PATCH v2 1/1] PCI: layerscape-ep: set 64-bit DMA mask

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Message-ID: <ZRLj8nHJrXB1DkkO@lizhi-Precision-Tower-5810>
Date:   Tue, 26 Sep 2023 10:00:18 -0400
From:   Frank Li <Frank.li@....com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     christophe.jaillet@...adoo.fr, bhelgaas@...gle.com,
        imx@...ts.linux.dev, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        lpieralisi@...nel.org, minghuan.Lian@....com, mingkai.hu@....com,
        robh@...nel.org, roy.zang@....com
Subject: Re: [PATCH v2 1/1] PCI: layerscape-ep: set 64-bit DMA mask

On Tue, Sep 26, 2023 at 12:27:32AM -0700, Christoph Hellwig wrote:
> > +	/* set 64-bit DMA mask and coherent DMA mask */
> > +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> 
> The comment is a bit silly :)
> 
> > +	if (ret)
> > +		return ret;
> 
> Also no need to check the return value when setting a 64-bit mask,
> but I guess it desn't hurt here.
> 

You are right, let me remove check.