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Date:	Thu, 03 Jan 2013 02:52:33 +0100
From:	"Rafael J. Wysocki" <>
To:	ACPI Devel Maling List <>
Cc:	LKML <>, Len Brown <>,
	Bjorn Helgaas <>
Subject: [PATCH] ACPI / scan: Do not use dummy HID for system bus ACPI nodes

From: Rafael J. Wysocki <>

At one point acpi_device_set_id() checks if acpi_device_hid(device)
returns NULL, but that never happens, so system bus devices with an
empty list of PNP IDs are given the dummy HID ("device") instead of
the "system bus HID" ("LNXSYBUS").  Fix the code to use the right

Signed-off-by: Rafael J. Wysocki <>
 drivers/acpi/scan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/acpi/scan.c
--- linux.orig/drivers/acpi/scan.c
+++ linux/drivers/acpi/scan.c
@@ -1398,7 +1398,7 @@ static void acpi_device_set_id(struct ac
 			acpi_add_id(device, ACPI_DOCK_HID);
 		else if (!acpi_ibm_smbus_match(device))
 			acpi_add_id(device, ACPI_SMBUS_IBM_HID);
-		else if (!acpi_device_hid(device) &&
+		else if (list_empty(&device->pnp.ids) &&
 			 ACPI_IS_ROOT_DEVICE(device->parent)) {
 			acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
 			strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);

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