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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2009-09-21 13:35:14 -0600 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-09-25 14:26:02 -0400 |
| commit | b1fbfb2ae8f2f0e04219218da6f52f7313466899 (patch) | |
| tree | f038ea487be82ccd96c21f143cdded80b0e52c12 /drivers/acpi/scan.c | |
| parent | ea8d82fd316208bd0ffe6f64823d04bcb8c57158 (diff) | |
| download | blackbird-op-linux-b1fbfb2ae8f2f0e04219218da6f52f7313466899.tar.gz blackbird-op-linux-b1fbfb2ae8f2f0e04219218da6f52f7313466899.zip | |
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 <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 10 |
1 files changed, 10 insertions, 0 deletions
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) { |
