ACPI / hotplug: Fix conflicted PCI bridge notify handlers

commit ca499fc87ed945094d952da0eb7eea7dbeb1feec upstream.

The PCI host bridge scan handler installs its own notify handler,
handle_hotplug_event_root(), by itself.  Nevertheless, the ACPI
hotplug framework also installs the common notify handler,
acpi_hotplug_notify_cb(), for PCI root bridges.  This causes
acpi_hotplug_notify_cb() to call _OST method with unsupported
error as hotplug.enabled is not set.

To address this issue, introduce hotplug.ignore flag, which
indicates that the scan handler installs its own notify handler by
itself.  The ACPI hotplug framework does not install the common
notify handler when this flag is set.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
[rjw: Changed the name of the new flag]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index e36842b9e1fad07eda05dde4db324673902d1680..a02a91cd1de4d48fcd62c8cf4c71fa7f41249415 100644 (file)
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -63,6 +63,9 @@ static struct acpi_scan_handler pci_root_handler = {
        .ids = root_device_ids,
        .attach = acpi_pci_root_add,
        .detach = acpi_pci_root_remove,
+       .hotplug = {
+               .ignore = true,
+       },
 };
 
 /* Lock to protect both acpi_pci_roots lists */

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 362f0c2aa1ea95eeb458d652e2c1fc22e959a8c1..cca761e80d898c538c31ec21887c97d72f4795e2 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1790,7 +1790,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
         */
        list_for_each_entry(hwid, &pnp.ids, list) {
                handler = acpi_scan_match_handler(hwid->id, NULL);
-               if (handler) {
+               if (handler && !handler->hotplug.ignore) {
                        acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                        acpi_hotplug_notify_cb, handler);
                        break;

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index f45b2a7800c49870c278ef74d43b84636c3636fb..6b66efdcd197f8b60d99281aa9e58b7c4ed27674 100644 (file)
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -97,6 +97,7 @@ enum acpi_hotplug_mode {
 struct acpi_hotplug_profile {
        struct kobject kobj;
        bool enabled:1;
+       bool ignore:1;
        enum acpi_hotplug_mode mode;
 };