system/systemd
system/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd synced 2024-10-06 16:21:34 +00:00
Code Issues Packages Projects Releases Wiki Activity

hwdb: ieee1394-unit-function: add comment about legacy AV/C devices

Browse source 
It appears that exceptional layout of legacy device requires extra care of
hwdb entry for node device since Linux FireWire subsystem do not pick up
numeric model identifier in vendor directory. In detail, see:

 * https://github.com/systemd/systemd/issues/25029

In the case, udev rule without model attribute is used. Thus hwdb entry
for generic AV/C device should match both cases with and without the
attribute. The wildcard added by a commit 5e577da5f8 ("hwdb: drop model
specifier from general entries") satisfies this condition,

This commit adds comment about it.
This commit is contained in:
Takashi Sakamoto 2022-10-31 12:48:31 +09:00
parent 8bc468190b
commit c017623254
1 changed files with 5 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
hwdb.d/80-ieee1394-unit-function.hwdb
View file

@ -42,6 +42,11 @@
# * Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading Association, TA Document
# 1999027)
#
# Exceptional layout of configuration ROM for legacy device is described in annex of the above
# document. The layout has some entries for model information in vendor directory instead of root
# or unit directories. For the case, Linux FireWire subsystem don't detect Model_ID and model name,
# thus node key without 'mo' field is detected. Wild card pattern is used to match the case with and
# without mo field in customized key for node device.
# Just for backward compatibility. Please invalidate IEEE1394_UNIT_FUNCTION_VIDEO by adding entries
# if it is inconvenient.