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ACPI / hotplug: Fix conflicted PCI bridge notify handlers 

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]
Cc: 3.9+ <stable@vger.kernel.org> # 3.9+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Toshi Kani 2013-11-20 14:25:34 +01:00 committed by Rafael J. Wysocki
parent 296e5809ee
commit ca499fc87e
3 changed files with 5 additions and 1 deletions
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3
drivers/acpi/pci_root.c
View File

@ -65,6 +65,9 @@ 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,
},
};
static DEFINE_MUTEX(osc_lock);

2
drivers/acpi/scan.c
View File

@ -1773,7 +1773,7 @@ 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;

1
include/acpi/acpi_bus.h
View File

@ -100,6 +100,7 @@ enum acpi_hotplug_mode {
struct acpi_hotplug_profile {
struct kobject kobj;
bool enabled:1;
bool ignore:1;
enum acpi_hotplug_mode mode;
};