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udev: do not execute hwdb builtin import twice or thrice 

Running the import more than once shouldn't matter, but it's a bit confusing
and causes a slowdown too. This patch reworks the rules to avoid duplicted runs,
but tries to keep the same imports. (E.g. import for pci devices without MODALIAS
is only done for tty devices.)

Note that this is only about hwdb import with argument, which uses MODALIAS as
the lookup key. There are other imports done with different lookup keys.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-06-14 18:34:27 +02:00
parent b4564641be
commit 876c75fe87
2 changed files with 5 additions and 3 deletions
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3
rules.d/50-udev-default.rules.in
View File

@ -10,8 +10,9 @@ SUBSYSTEM=="virtio-ports", KERNEL=="vport*", ATTR{name}=="?*", SYMLINK+="virtio-
SUBSYSTEM=="rtc", ATTR{hctosys}=="1", SYMLINK+="rtc"
SUBSYSTEM=="rtc", KERNEL=="rtc0", SYMLINK+="rtc", OPTIONS+="link_priority=-100"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", IMPORT{builtin}="usb_id", IMPORT{builtin}="hwdb --subsystem=usb"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", IMPORT{builtin}="usb_id", IMPORT{builtin}="hwdb --subsystem=usb", GOTO="default_hwdb_imported"
ENV{MODALIAS}!="", IMPORT{builtin}="hwdb --subsystem=$env{SUBSYSTEM}"
LABEL="default_hwdb_imported"
ACTION!="add", GOTO="default_end"

5
rules.d/60-serial.rules
View File

@ -4,8 +4,9 @@ ACTION=="remove", GOTO="serial_end"
SUBSYSTEM!="tty", GOTO="serial_end"
SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
SUBSYSTEMS=="pci", IMPORT{builtin}="hwdb --subsystem=pci"
SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id", IMPORT{builtin}="hwdb --subsystem=usb"
# We already ran the hwdb builtin for devices with MODALIAS in 50-default.rules.
# Let's cover the remaining case here, where we walk up the tree to find a node with $MODALIAS.
ENV{MODALIAS}=="", SUBSYSTEMS=="pci", IMPORT{builtin}="hwdb --subsystem=pci"
# /dev/serial/by-path/, /dev/serial/by-id/ for USB devices
KERNEL!="ttyUSB[0-9]*|ttyACM[0-9]*", GOTO="serial_end"