linux-kernel - Re: [RFC PATCH 07/14] hotplug/PCI: use PCIe cap access functions to simplify implementation

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Date:	Tue, 10 Jul 2012 12:35:59 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Don Dutile <ddutile@...hat.com>, Jiang Liu <jiang.liu@...wei.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Keping Chen <chenkeping@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH 07/14] hotplug/PCI: use PCIe cap access functions to
 simplify implementation

On Tue, Jul 10, 2012 at 9:54 AM, Jiang Liu <liuj97@...il.com> wrote:
> From: Jiang Liu <jiang.liu@...wei.com>
>
> Use PCIe cap access functions to simplify pcihp_slot.c
>
> Signed-off-by: Jiang Liu <liuj97@...il.com>
> ---
>  drivers/pci/hotplug/pcihp_slot.c |   17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pcihp_slot.c b/drivers/pci/hotplug/pcihp_slot.c
> index 8c05a18..08ca019 100644
> --- a/drivers/pci/hotplug/pcihp_slot.c
> +++ b/drivers/pci/hotplug/pcihp_slot.c
> @@ -103,8 +103,7 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
>                 return;
>
>         /* Find PCI Express capability */

Drop the comment, too.

> -       pos = pci_pcie_cap(dev);
> -       if (!pos)
> +       if (!pci_is_pcie(dev))
>                 return;
>
>         if (hpp->revision > 1) {
> @@ -114,16 +113,18 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
>         }
>
>         /* Initialize Device Control Register */
> -       pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
> +       if (pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &reg16))
> +               return;
>         reg16 = (reg16 & hpp->pci_exp_devctl_and) | hpp->pci_exp_devctl_or;
> -       pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
> +       pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, reg16);
>
>         /* Initialize Link Control Register */
>         if (dev->subordinate) {
> -               pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &reg16);
> -               reg16 = (reg16 & hpp->pci_exp_lnkctl_and)
> -                       | hpp->pci_exp_lnkctl_or;
> -               pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, reg16);
> +               if (pci_pcie_cap_read_word(dev, PCI_EXP_LNKCTL, &reg16)) {
> +                       reg16 = (reg16 & hpp->pci_exp_lnkctl_and)
> +                               | hpp->pci_exp_lnkctl_or;
> +                       pci_pcie_cap_write_word(dev, PCI_EXP_LNKCTL, reg16);
> +               }
>         }
>
>         /* Find Advanced Error Reporting Enhanced Capability */
> --
> 1.7.9.5
>
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