linux-kernel - Re: [PATCH 10/12] PCI, pciehp: Separate pci_hp_add

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Date:	Thu, 15 Mar 2012 15:42:14 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] PCI, pciehp: Separate pci_hp_add_bridge()

On Tue, Mar 13, 2012 at 1:26 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> Will use it for other pci hp hotplug support
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/hotplug-pci.c        |   13 +++++++++++++
>  drivers/pci/hotplug/pciehp_pci.c |   18 ++----------------
>  drivers/pci/pci.h                |    1 +
>  3 files changed, 16 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
> index d3509cd..d0999b1 100644
> --- a/drivers/pci/hotplug-pci.c
> +++ b/drivers/pci/hotplug-pci.c
> @@ -4,6 +4,19 @@
>  #include <linux/export.h>
>  #include "pci.h"
>
> +int __ref pci_hp_add_bridge(struct pci_dev *dev)
> +{
> +       struct pci_bus *parent = dev->bus;
> +       int pass, busnr = parent->secondary;
> +
> +       for (pass = 0; pass < 2; pass++)
> +               busnr = pci_scan_bridge(parent, dev, busnr, pass);
> +       if (!dev->subordinate)
> +               return -1;
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(pci_hp_add_bridge);

I'm not sure this is baked enough to use EXPORT_SYMBOL() rather than
EXPORT_SYMBOL_GPL().  For example, maybe we can use the same "add
bridge" interface we normally use, rather than inventing a new
hotplug-specific one.  Using EXPORT_SYMBOL() would force us to keep
this interface longer than we might want to.

>  unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
>  {
> diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
> index e21171c..b9a9fce 100644
> --- a/drivers/pci/hotplug/pciehp_pci.c
> +++ b/drivers/pci/hotplug/pciehp_pci.c
> @@ -34,19 +34,6 @@
>  #include "../pci.h"
>  #include "pciehp.h"
>
> -static int __ref pciehp_add_bridge(struct pci_dev *dev)
> -{
> -       struct pci_bus *parent = dev->bus;
> -       int pass, busnr = parent->secondary;
> -
> -       for (pass = 0; pass < 2; pass++)
> -               busnr = pci_scan_bridge(parent, dev, busnr, pass);
> -       if (!dev->subordinate)
> -               return -1;
> -
> -       return 0;
> -}
> -
>  int pciehp_configure_device(struct slot *p_slot)
>  {
>        struct pci_dev *dev;
> @@ -75,9 +62,8 @@ int pciehp_configure_device(struct slot *p_slot)
>                if (!dev)
>                        continue;
>                if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
> -                               (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
> -                       pciehp_add_bridge(dev);
> -               }
> +                   (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
> +                       pci_hp_add_bridge(dev);
>                pci_dev_put(dev);
>        }
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 13b1159..9378d81 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -124,6 +124,7 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
>  #endif
>
>  /* Functions for PCI Hotplug drivers to use */
> +int pci_hp_add_bridge(struct pci_dev *dev);
>  extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
>
>  #ifdef HAVE_PCI_LEGACY
> --
> 1.7.7
>
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