linux-kernel - Re: [PATCH 06/23] PCI: rescan with bus or bridge using callback method too

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 8 Mar 2012 17:56:25 -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 06/23] PCI: rescan with bus or bridge using callback
 method too

On Tue, Mar 6, 2012 at 12:13 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> Just like removal.
>
> Because We could add new bus under the bridges...
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/pci-sysfs.c |   43 +++++++++++++++++++++++++++++++------------
>  1 files changed, 31 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 2049b2f..1794508 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -325,21 +325,31 @@ dev_rescan_store(struct device *dev, struct device_attribute *attr,
>        return count;
>  }
>
> +static void bridge_rescan_callback(struct device *dev)
> +{
> +       struct pci_dev *pdev = to_pci_dev(dev);
> +
> +       mutex_lock(&pci_remove_rescan_mutex);
> +       pci_rescan_bus_bridge_resize(pdev);
> +       mutex_unlock(&pci_remove_rescan_mutex);
> +}
> +
>  static ssize_t
>  dev_bridge_rescan_store(struct device *dev, struct device_attribute *attr,
>                 const char *buf, size_t count)
>  {
> +       int ret = 0;
>        unsigned long val;
> -       struct pci_dev *pdev = to_pci_dev(dev);
>
>        if (kstrtoul(buf, 0, &val) < 0)
>                return -EINVAL;
>
> -       if (val) {
> -               mutex_lock(&pci_remove_rescan_mutex);
> -               pci_rescan_bus_bridge_resize(pdev);
> -               mutex_unlock(&pci_remove_rescan_mutex);
> -       }
> +       if (val)
> +               ret = device_schedule_callback(dev, bridge_rescan_callback);
> +
> +       if (ret)
> +               count = ret;
> +
>        return count;

I see that you copied this style from remove_store(), but it's ugly
and hard to follow.  I think this would be more readable:

    if (!val)
        return count;

    err = device_schedule_callback(dev, bridge_rescan_callback);
    if (err)
        return err;

    return count;

>  }
>
> @@ -375,21 +385,30 @@ remove_store(struct device *dev, struct device_attribute *dummy,
>        return count;
>  }
>
> +static void bus_rescan_callback(struct device *dev)
> +{
> +       struct pci_bus *bus = to_pci_bus(dev);
> +
> +       mutex_lock(&pci_remove_rescan_mutex);
> +       pci_rescan_bus(bus);
> +       mutex_unlock(&pci_remove_rescan_mutex);
> +}
>  static ssize_t
>  dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
>                 const char *buf, size_t count)
>  {
> +       int ret = 0;
>        unsigned long val;
> -       struct pci_bus *bus = to_pci_bus(dev);
>
>        if (strict_strtoul(buf, 0, &val) < 0)
>                return -EINVAL;
>
> -       if (val) {
> -               mutex_lock(&pci_remove_rescan_mutex);
> -               pci_rescan_bus(bus);
> -               mutex_unlock(&pci_remove_rescan_mutex);
> -       }
> +       if (val)
> +               ret = device_schedule_callback(dev, bus_rescan_callback);
> +
> +       if (ret)
> +               count = ret;
> +
>        return count;
>  }
>
> --
> 1.7.7
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/