The patch below does not apply to the 3.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3f327e39b4b8f760c331bb2836735be6d83fbf53 Mon Sep 17 00:00:00 2001 From: Yinghai Lu <[email protected]> Date: Tue, 7 May 2013 11:06:03 -0600 Subject: [PATCH] PCI: acpiphp: Re-enumerate devices when host bridge receives Bus Check When a PCI host bridge device receives a Bus Check notification, we must re-enumerate starting with the bridge to discover changes (devices that have been added or removed). Prior to 668192b678 ("PCI: acpiphp: Move host bridge hotplug to pci_root.c"), this happened in _handle_hotplug_event_bridge(). After that commit, _handle_hotplug_event_bridge() is not installed for host bridges, and the host bridge notify handler, _handle_hotplug_event_root() did not re-enumerate. This patch adds re-enumeration to _handle_hotplug_event_root(). This fixes cases where we don't notice the addition or removal of PCI devices, e.g., the PCI-to-USB ExpressCard in the bugzilla below. [bhelgaas: changelog, references] Reference: https://lkml.kernel.org/r/CAAh6nkmbKR3HTqm5ommevsBwhL_u0N8Rk7Wsms_LfP=nbgk...@mail.gmail.com Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57961 Reported-by: Gavin Guo <[email protected]> Tested-by: Gavin Guo <[email protected]> Signed-off-by: Yinghai Lu <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Reviewed-by: Jiang Liu <[email protected]> Acked-by: Rafael J. Wysocki <[email protected]> CC: [email protected] # v3.9+ diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 1dd6f6c..e427dc5 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -641,7 +641,9 @@ static void _handle_hotplug_event_root(struct work_struct *work) /* bus enumerate */ printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__, (char *)buffer.pointer); - if (!root) + if (root) + acpiphp_check_host_bridge(handle); + else handle_root_bridge_insertion(handle); break; diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 96fed19..716aa93 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -950,6 +950,20 @@ check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) return AE_OK ; } +void acpiphp_check_host_bridge(acpi_handle handle) +{ + struct acpiphp_bridge *bridge; + + bridge = acpiphp_handle_to_bridge(handle); + if (bridge) { + acpiphp_check_bridge(bridge); + put_bridge(bridge); + } + + acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, + ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); +} + static void _handle_hotplug_event_bridge(struct work_struct *work) { struct acpiphp_bridge *bridge; diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 81b3161..1704479 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -60,11 +60,13 @@ static inline void acpi_pci_slot_remove(struct pci_bus *bus) { } void acpiphp_init(void); void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle); void acpiphp_remove_slots(struct pci_bus *bus); +void acpiphp_check_host_bridge(acpi_handle handle); #else static inline void acpiphp_init(void) { } static inline void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle) { } static inline void acpiphp_remove_slots(struct pci_bus *bus) { } +static inline void acpiphp_check_host_bridge(acpi_handle handle) { } #endif #else /* CONFIG_ACPI */ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
