[systemd-devel] [PATCH v3 1/2] Don't use ALSA card id in ID_ID

[Adam Goode]

The ALSA id sysattr is generated by the sound subsystem and is not
a stable identifier. It is generated though some string manipulation
then made unique if there is a conflict. This means that it is
enumeration-dependent and shouldn't be used for ID_ID.

If ID_ID is supposed to be system-unique, it is not already since
for firewire it is generated from the guid and there are broken
firewire devices that have duplicate guids across devices.

This is tracked for PulseAudio at
https://bugs.freedesktop.org/show_bug.cgi?id=90129.

This is essentially a revert of systemd
ed1b2d9fc7d5c5bfe2a67b0b8ff9e5ea8694268e.
---
 rules/78-sound-card.rules | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/78-sound-card.rules b/rules/78-sound-card.rules
index 295f490..bd7a994 100644
--- a/rules/78-sound-card.rules
+++ b/rules/78-sound-card.rules
@@ -49,8 +49,8 @@ SUBSYSTEMS=="firewire", GOTO="skip_pci"
 SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
 LABEL="skip_pci"
 
-ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}-$attr{id}"
-ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$attr{id}"
+ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}"
+ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}"
 
 IMPORT{builtin}="path_id"
 
-- 
2.2.0.rc0.207.ga3a616c