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authorYinghai Lu <yinghai@kernel.org>2013-05-07 11:06:03 -0600
committerBjorn Helgaas <bhelgaas@google.com>2013-05-17 14:12:06 -0600
commit3f327e39b4b8f760c331bb2836735be6d83fbf53 (patch)
treec2ebbf36764c554c31d82a82a6afb174c8e2b698
parentf722406faae2d073cc1d01063d1123c35425939e (diff)
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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=nBgKNew@mail.gmail.com Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57961 Reported-by: Gavin Guo <tuffkidtt@gmail.com> Tested-by: Gavin Guo <tuffkidtt@gmail.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> CC: stable@vger.kernel.org # v3.9+
-rw-r--r--drivers/acpi/pci_root.c4
-rw-r--r--drivers/pci/hotplug/acpiphp_glue.c14
-rw-r--r--include/linux/pci-acpi.h2
3 files changed, 19 insertions, 1 deletions
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 */
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