linux-kernel - Re: [PATCH 07/10] swiotlb: refactor swiotlb_map

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Message-ID: <20181019003715.GI1251@char.us.oracle.com>
Date:   Thu, 18 Oct 2018 20:37:15 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] swiotlb: refactor swiotlb_map_page

> > +	if (!dma_capable(dev, dma_addr, size) ||
> > +	    swiotlb_force == SWIOTLB_FORCE) {
> > +		trace_swiotlb_bounced(dev, dma_addr, size, swiotlb_force);
> > +		dma_addr = swiotlb_bounce_page(dev, &phys, size, dir, attrs);
> > +	}
> 
> FWIW I prefer the inverse condition and early return of the original code
> here, which also then allows a tail-call to swiotlb_bounce_page() (and saves
> a couple of lines), but it's no biggie.
> 
> Reviewed-by: Robin Murphy <robin.murphy@....com>

I agree with Robin - it certainly makes it easier to read.

With that small change:
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Thank you!

> 
> > -	return DIRECT_MAPPING_ERROR;
> > +	return dma_addr;
> >   }
> >   /*
> >