linux-kernel - Re: [PATCH 2/4] ARM/footbridge: switch to use dma_direct_set

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Date:   Thu, 17 Sep 2020 19:53:40 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/4] ARM/footbridge: switch to use dma_direct_set_offset
 for lbus DMA offsets

On Thu, Sep 17, 2020 at 07:32:27PM +0200, Christoph Hellwig wrote:
>  static int __init cats_pci_init(void)
>  {
> -	if (machine_is_cats())
> -		pci_common_init(&cats_pci);
> +	if (!machine_is_cats())
> +		return 0;
> +	bus_register_notifier(&pci_bus_type, &footbridge_pci_dma_nb);
> +	pci_common_init(&cats_pci);

I'd prefer these things to retain a positive-logic construct, so:

	if (machine_is_cats()) {
		bus_register_notifier(&pci_bus_type, &footbridge_pci_dma_nb);
		pci_common_init(&cats_pci);
	}

It's the same number of lines.

Otherwise, I think it's fine. I'll try to find some spare time to give
it a go on a Netwinder.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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