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author | Zhang Rui <rui.zhang@intel.com> | 2006-12-08 04:23:43 -0500 |
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committer | Len Brown <len.brown@intel.com> | 2006-12-21 03:05:51 -0500 |
commit | e49bd2dd5a503bb94fe2f2af45422b610940b75d (patch) | |
tree | 9ae6510a91f8b43197e32f08b328fa142e594b26 /mm | |
parent | ae8433324be16673c75951986dcf85f29c090557 (diff) |
ACPI: use PNPID:instance_no as bus_id of ACPI device
Previously we used the device name in the DSDT, but would
crash upon encountering a duplicate. Also, exposing the
DSDT device name to the user in a patch isn't a good idea,
because it is arbitrary.
After some discussion, we finally decided to use
"PNPID:instance_no" as the bus_id of ACPI devices.
Two attributes for each device are added at the same time,
the full pathname in ACPI namespace and hardware_id if it has.
NOTE: acpi_bus_id_list is used to keep the information of PNPID
and instance number of the given PNPID. Loop the
acpi_bus_id_list to find the instance_no of the same PNPID
when register a device. If failed, i.e. we don't have a
node with this PNPID, allocate one and link it to this list.
NOTE: Now I don't take the memory free work in charge.
If necessary, I can add a reference count in
struct acpi_device_bus_id, and check the reference and
when unregister a device, i.e. memory is freed when
the reference count of a given PNPID is 0.
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions