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Date: Thu, 15 Mar 2012 11:55:37 -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 v2 35/37] PCI: Make /sys/bus/pci/rescan rescan root On Tue, Mar 13, 2012 at 12:26 AM, Yinghai Lu <yinghai@...nel.org> wrote: > On Mon, Mar 12, 2012 at 8:44 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: >> On Sat, Mar 10, 2012 at 12:00 AM, Yinghai Lu <yinghai@...nel.org> wrote: >>> It will rediscover removed pci root buses. >>> >>> Signed-off-by: Yinghai Lu <yinghai@...nel.org> >>> --- >>> drivers/pci/pci-sysfs.c | 2 ++ >>> 1 files changed, 2 insertions(+), 0 deletions(-) >>> >>> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c >>> index 4d122cb..fc0a7de 100644 >>> --- a/drivers/pci/pci-sysfs.c >>> +++ b/drivers/pci/pci-sysfs.c >>> @@ -284,6 +284,7 @@ msi_bus_store(struct device *dev, struct device_attribute *attr, >>> >>> #ifdef CONFIG_HOTPLUG >>> static DEFINE_MUTEX(pci_remove_rescan_mutex); >>> +void __weak arch_pci_root_rescan(void) { } >>> static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, >>> size_t count) >>> { >>> @@ -295,6 +296,7 @@ static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, >>> >>> if (val) { >>> mutex_lock(&pci_remove_rescan_mutex); >>> + arch_pci_root_rescan(); >>> while ((b = pci_find_next_bus(b)) != NULL) >>> pci_rescan_bus(b); >>> mutex_unlock(&pci_remove_rescan_mutex); >> >> This is gross. We used to rescan every previously-discovered PCI root bus. >> >> Now, we do the same, plus: >> 1) Scan the ACPI namespace for PCI host bridges, adding and scanning >> any we haven't seen before, and >> 2) scan domain 0, buses 0 - pcibios_last_bus, looking for any we >> haven't seen before. > > to have /sys/bus/pci/scan_root again? Host bridges are not PCI devices, so scanning for them is not a PCI operation. It should not be in the /sys/bus/pci hierarchy. -- 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/
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