Patchwork [3.5.y.z,extended,stable] Patch "ACPI / scan: Do not use dummy HID for system bus ACPI nodes" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Jan. 15, 2013, 10:21 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/212338/
State New
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Herton Ronaldo Krzesinski - Jan. 15, 2013, 10:21 p.m.
This is a note to let you know that I have just added a patch titled

    ACPI / scan: Do not use dummy HID for system bus ACPI nodes

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 05a295691a8fc92d38342959bf1ca6e6d0ea0ca0 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <>
Date: Fri, 4 Jan 2013 23:00:54 +0100
Subject: [PATCH] ACPI / scan: Do not use dummy HID for system bus ACPI nodes

commit 4f5f64cf0cc916220aaa055992e31195470cfe37 upstream.

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



diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 803c4ec..fcae116 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1162,7 +1162,7 @@  static void acpi_device_set_id(struct acpi_device *device)
 			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);