linux-kernel - Re: [PATCH 2/3] PCI: of: Simplify bus range parsing

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Message-ID: <20250103213846.GA6313@bhelgaas>
Date: Fri, 3 Jan 2025 15:38:46 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: "David S . Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/3] PCI: of: Simplify bus range parsing

On Fri, Jan 03, 2025 at 03:31:28PM -0600, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> of_pci_parse_bus_range() looks for a DT "bus-range" property.  If none
> exists, devm_of_pci_get_host_bridge_resources() defaults to the [bus 00-ff]
> range supplied by its caller, pci_parse_request_of_pci_ranges().
> 
> devm_of_pci_get_host_bridge_resources() is static and has no other callers,
> so there's no reason to complicate its interface by passing the default bus
> range.
> 
> Drop the busno and bus_max parameters and use 0x0 and 0xff directly in
> devm_of_pci_get_host_bridge_resources().

Since we default this if the DT lacks "bus-range", is there any point
in repeating "bus-range = <0x00 0xff>;" in all the host bridge
descriptions?

> @@ -343,8 +340,8 @@ static int devm_of_pci_get_host_bridge_resources(struct device *dev,
>  
>  	err = of_pci_parse_bus_range(dev_node, bus_range);
>  	if (err) {
> -		bus_range->start = busno;
> -		bus_range->end = bus_max;
> +		bus_range->start = 0;
> +		bus_range->end = 0xff;
>  		bus_range->flags = IORESOURCE_BUS;
>  		dev_info(dev, "  No bus range found for %pOF, using %pR\n",
>  			 dev_node, bus_range);