linux-kernel - Re: [PATCH v3 09/27] arm/PCI: Clean unused pcibios_add_bus() and pcibios_remove

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Message-ID: <20141023053858.GD11770@google.com>
Date:	Wed, 22 Oct 2014 23:38:58 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Xinwei Hu <huxinwei@...wei.com>, Wuyun <wuyun.wu@...wei.com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	linux-arch@...r.kernel.org, arnab.basu@...escale.com,
	Bharat.Bhushan@...escale.com, x86@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org, Joerg Roedel <joro@...tes.org>,
	iommu@...ts.linux-foundation.org, linux-mips@...ux-mips.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	David Vrabel <david.vrabel@...rix.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thierry Reding <thierry.reding@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Liviu Dudau <liviu@...au.co.uk>
Subject: Re: [PATCH v3 09/27] arm/PCI: Clean unused pcibios_add_bus() and
 pcibios_remove_bus()

On Wed, Oct 15, 2014 at 11:06:57AM +0800, Yijing Wang wrote:
> MSI chip will be saved in pci_sys_data, now we can
> clean up pcibios_add_bus() and pcibios_remove_bus()
> in arm, and use pci_find_msi_chip() to get msi chip
> in core MSI code.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  arch/arm/include/asm/mach/pci.h |    4 ----
>  arch/arm/kernel/bios32.c        |   16 ----------------
>  drivers/pci/msi.c               |   11 +++--------
>  3 files changed, 3 insertions(+), 28 deletions(-)
> 
> diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
> index 59b0d87..230b2c9 100644
> --- a/arch/arm/include/asm/mach/pci.h
> +++ b/arch/arm/include/asm/mach/pci.h
> @@ -39,8 +39,6 @@ struct hw_pci {
>  					  resource_size_t start,
>  					  resource_size_t size,
>  					  resource_size_t align);
> -	void		(*add_bus)(struct pci_bus *bus);
> -	void		(*remove_bus)(struct pci_bus *bus);
>  };
>  
>  /*
> @@ -71,8 +69,6 @@ struct pci_sys_data {
>  					  resource_size_t start,
>  					  resource_size_t size,
>  					  resource_size_t align);
> -	void		(*add_bus)(struct pci_bus *bus);
> -	void		(*remove_bus)(struct pci_bus *bus);
>  	void		*private_data;	/* platform controller private data	*/
>  };
>  
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index a19038d..b1b872e 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -360,20 +360,6 @@ void pcibios_fixup_bus(struct pci_bus *bus)
>  }
>  EXPORT_SYMBOL(pcibios_fixup_bus);
>  
> -void pcibios_add_bus(struct pci_bus *bus)
> -{
> -	struct pci_sys_data *sys = bus->sysdata;
> -	if (sys->add_bus)
> -		sys->add_bus(bus);
> -}
> -
> -void pcibios_remove_bus(struct pci_bus *bus)
> -{
> -	struct pci_sys_data *sys = bus->sysdata;
> -	if (sys->remove_bus)
> -		sys->remove_bus(bus);
> -}
> -
>  /*
>   * Swizzle the device pin each time we cross a bridge.  If a platform does
>   * not provide a swizzle function, we perform the standard PCI swizzling.
> @@ -478,8 +464,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
>  		sys->swizzle = hw->swizzle;
>  		sys->map_irq = hw->map_irq;
>  		sys->align_resource = hw->align_resource;
> -		sys->add_bus = hw->add_bus;
> -		sys->remove_bus = hw->remove_bus;
>  		INIT_LIST_HEAD(&sys->resources);
>  
>  		if (hw->private_data)

What do the core changes below have to do with the ARM changes above?
They should be a separate patch unless they can't be separated.

> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index f11108c..56e54ad 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -32,12 +32,10 @@ int pci_msi_ignore_mask;
>  
>  int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
>  {
> -	struct msi_chip *chip = dev->bus->msi;
> +	struct msi_chip *chip;
>  	int err;
>  
> -	if (!chip)
> -		chip = pci_msi_chip(dev->bus);
> -
> +	chip = pci_msi_chip(dev->bus);
>  	if (!chip || !chip->setup_irq)
>  		return -EINVAL;
>  
> @@ -51,10 +49,7 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
>  void __weak arch_teardown_msi_irq(unsigned int irq)
>  {
>  	struct msi_desc *entry = irq_get_msi_desc(irq);
> -	struct msi_chip *chip = entry->dev->bus->msi;
> -
> -	if (!chip)
> -		chip = pci_msi_chip(entry->dev->bus);
> +	struct msi_chip *chip = pci_msi_chip(entry->dev->bus);
>  
>  	if (!chip || !chip->teardown_irq)
>  		return;
> -- 
> 1.7.1
> 
> --
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