linux-kernel - Re: [PATCH V9 06/11] PCI: Refactor generic bus domain assignment

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Date:	Fri, 10 Jun 2016 21:50:26 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Tomasz Nowicki <tn@...ihalf.com>
Cc:	helgaas@...nel.org, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rafael@...nel.org, hanjun.guo@...aro.org,
	okaya@...eaurora.org, jchandra@...adcom.com,
	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	jcm@...hat.com, andrea.gallo@...aro.org, dhdang@....com,
	jeremy.linton@....com, liudongdong3@...wei.com, cov@...eaurora.org
Subject: Re: [PATCH V9 06/11] PCI: Refactor generic bus domain assignment

On Fri, Jun 10, 2016 at 09:55:14PM +0200, Tomasz Nowicki wrote:
> Change the way PCI bus domain number is assigned and improve function
> name to reflect what function does. No functional changes.
> 
> Instead of assigning bus domain number inside of pci_bus_assign_domain_nr()
> simply return domain number and let pci_create_root_bus() do assignment.
> This way pci_create_root_bus() setups bus structure data in the consistent
> way. Since pci_bus_assign_domain_nr() now does not assign but retrieves
> domain number instead, rename it to pci_bus_find_domain_nr().
> 
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>

Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>

> ---
>  drivers/pci/pci.c   | 4 ++--
>  drivers/pci/probe.c | 4 +++-
>  include/linux/pci.h | 7 +------
>  3 files changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index eb431b5..b9a7833 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4941,7 +4941,7 @@ int pci_get_new_domain_nr(void)
>  }
>  
>  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> -void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
> +int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent)
>  {
>  	static int use_dt_domains = -1;
>  	int domain = -1;
> @@ -4985,7 +4985,7 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
>  		domain = -1;
>  	}
>  
> -	bus->domain_nr = domain;
> +	return domain;
>  }
>  #endif
>  #endif
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8e3ef72..380d46d 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2127,7 +2127,9 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>  	b->sysdata = sysdata;
>  	b->ops = ops;
>  	b->number = b->busn_res.start = bus;
> -	pci_bus_assign_domain_nr(b, parent);
> +#ifdef CONFIG_PCI_DOMAINS_GENERIC
> +	b->domain_nr = pci_bus_find_domain_nr(b, parent);
> +#endif
>  	b2 = pci_find_bus(pci_domain_nr(b), bus);
>  	if (b2) {
>  		/* If we already got to this bus through a different bridge, ignore it */
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index ce03d65..48839e8 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1390,12 +1390,7 @@ static inline int pci_domain_nr(struct pci_bus *bus)
>  {
>  	return bus->domain_nr;
>  }
> -void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent);
> -#else
> -static inline void pci_bus_assign_domain_nr(struct pci_bus *bus,
> -					struct device *parent)
> -{
> -}
> +int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent);
>  #endif
>  
>  /* some architectures require additional setup to direct VGA traffic */
> -- 
> 1.9.1
>