systemd: add --subsystem=pci to udevadm trigger call

plymouth-start.service does this sort of hacky
"udevadm trigger" call before doing plymouth show-splash,
to ensure plymouth show-splash is called after the
graphcis subsystem is up.  Because this udev trigger call
only passes --subsystem-match calls with no corresponding
--subsystem call, it will trawl through all subsystems in
/sys rather than just the pci subsystem (where all the matches
are guaranteed to be).

This commit adds --subsystem=pci to stop doing that extra work.

All of this will eventually be replaced with plymouthd either
listening for the udev  events itself (or potentially logind,
if logind gains a way to tag a "graphics" capability on a seat).

diff --git a/systemd-units/plymouth-start.service.in b/systemd-units/plymouth-start.service.in
index f2c6c84ec6e82610496c0b1c5bcafe4d98470bcd..81a5f371069fefbe3ebb8bf99821ca35758386b4 100644 (file)
--- a/systemd-units/plymouth-start.service.in
+++ b/systemd-units/plymouth-start.service.in
@@ -9,5 +9,5 @@ ConditionPathExists=!@plymouthruntimedir@/pid
 
 [Service]
 ExecStart=@PLYMOUTH_DAEMON_DIR@/plymouthd --mode=boot --pid-file=@plymouthruntimedir@/pid --attach-to-session
-ExecStartPost=-/bin/udevadm trigger --action=add --attr-match=class=0x030000 ; -/bin/udevadm trigger --action=add --subsystem-match=graphics --subsystem-match=drm --subsystem-match=tty ; -/bin/udevadm settle --timeout=30 ; -@PLYMOUTH_CLIENT_DIR@/plymouth show-splash
+ExecStartPost=-/bin/udevadm trigger --action=add --attr-match=class=0x030000 ; -/bin/udevadm trigger --action=add --subsystem-match=graphics --subsystem-match=drm --subsystem-match=tty --subsystem=pci; -/bin/udevadm settle --timeout=30 ; -@PLYMOUTH_CLIENT_DIR@/plymouth show-splash
 Type=forking