linux-kernel - Re: [PATCH 14/23] PCI: add __pci_remove_bus

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Date:	Thu, 8 Mar 2012 18:11:35 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/23] PCI: add __pci_remove_bus_devices()

On Tue, Mar 6, 2012 at 12:13 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> will use it with pci_stop_and_remove_bus later.
>
> also remove __pci_remove_behind_bridge and pci_stop_behind_bridge.
>
> they are same except one take bridge and one take bus.
>
> and we already have pci_stop_bus_devices()
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/remove.c |   28 +++++++++++-----------------
>  1 files changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index 243d59b..62c348c 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -78,7 +78,7 @@ void pci_remove_bus(struct pci_bus *pci_bus)
>  }
>  EXPORT_SYMBOL(pci_remove_bus);
>
> -static void __pci_remove_behind_bridge(struct pci_dev *dev);
> +static void __pci_remove_bus_devices(struct pci_bus *bus);
>  /**
>  * pci_stop_and_remove_bus_device - remove a PCI device and any children
>  * @dev: the device to remove
> @@ -96,7 +96,7 @@ void __pci_remove_bus_device(struct pci_dev *dev)
>        if (dev->subordinate) {
>                struct pci_bus *b = dev->subordinate;
>
> -               __pci_remove_behind_bridge(dev);
> +               __pci_remove_bus_devices(b);
>                pci_remove_bus(b);
>                dev->subordinate = NULL;
>        }
> @@ -111,22 +111,12 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev)
>        __pci_remove_bus_device(dev);
>  }
>
> -static void __pci_remove_behind_bridge(struct pci_dev *dev)
> +static void __pci_remove_bus_devices(struct pci_bus *bus)
>  {
>        struct list_head *l, *n;
>
> -       if (dev->subordinate)
> -               list_for_each_safe(l, n, &dev->subordinate->devices)
> -                       __pci_remove_bus_device(pci_dev_b(l));
> -}
> -
> -static void pci_stop_behind_bridge(struct pci_dev *dev)
> -{
> -       struct list_head *l, *n;
> -
> -       if (dev->subordinate)
> -               list_for_each_safe(l, n, &dev->subordinate->devices)
> -                       pci_stop_bus_device(pci_dev_b(l));
> +       list_for_each_safe(l, n, &bus->devices)
> +               __pci_remove_bus_device(pci_dev_b(l));

Use list_for_each_entry_safe() so you don't need pci_dev_b().

>  }
>
>  static void pci_stop_bus_devices(struct pci_bus *bus)
> @@ -158,8 +148,12 @@ static void pci_stop_bus_devices(struct pci_bus *bus)
>  */
>  void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
>  {
> -       pci_stop_behind_bridge(dev);
> -       __pci_remove_behind_bridge(dev);
> +       struct pci_bus *bus = dev->subordinate;
> +
> +       if (bus) {

Don't check "bus" here.  If the caller screws up and passes a
non-bridge pointer, I want to learn about it rather than ignore it.

> +               pci_stop_bus_devices(bus);
> +               __pci_remove_bus_devices(bus);
> +       }
>  }
>
>  /**
> --
> 1.7.7
>
> --
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