From: Bjorn Helgaas Date: Mon, 21 Sep 2009 19:35:14 +0000 (-0600) Subject: ACPI: make sure every acpi_device has an ID X-Git-Tag: Ubuntu-5.2.0-15.16~27558^2~2^2~5 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b1fbfb2ae8f2f0e04219218da6f52f7313466899;p=mirror_ubuntu-eoan-kernel.git ACPI: make sure every acpi_device has an ID This makes sure every acpi_device has at least one ID. If we build an acpi_device for a namespace node with no _HID or _CID, we sometimes synthesize an ID like "LNXCPU" or "LNXVIDEO". If we don't even have that, give it a default "device" ID. Note that this means things like: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/HWP0001:00/HWP0002:04/device:00 (a PCI slot SxFy device) will have "hid" and "modprobe" entries, where they didn't before. These aren't very useful (a HID of "device" doesn't tell you what *kind* of device it is, so it doesn't help find a driver), but I don't think they're harmful. Signed-off-by: Bjorn Helgaas Signed-off-by: Len Brown --- diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 269c0aae4bed..53b96e7a64ab 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1155,6 +1155,16 @@ static void acpi_device_set_id(struct acpi_device *device) break; } + /* + * We build acpi_devices for some objects that don't have _HID or _CID, + * e.g., PCI bridges and slots. Drivers can't bind to these objects, + * but we do use them indirectly by traversing the acpi_device tree. + * This generic ID isn't useful for driver binding, but it provides + * the useful property that "every acpi_device has an ID." + */ + if (!hid && !cid_list && !cid_add) + hid = "device"; + if (hid) { device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1); if (device->pnp.hardware_id) {