Messages in this thread | | | From | Kai-Heng Feng <> | Date | Sat, 9 Jan 2021 00:25:28 +0800 | Subject | Multiple MODALIAS= in uevent file confuses userspace |
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Commit 8765c5ba19490 ("ACPI / scan: Rework modalias creation when "compatible" is present") creates two modaliases for certain ACPI devices. However userspace (systemd-udevd in this case) assumes uevent file doesn't have duplicated keys, so two "MODALIAS=" breaks the assumption.
Based on the assumption, systemd-udevd internally uses hashmap to store each line of uevent file, so the second modalias always replaces the first modalias.
My attempt [1] is to add a new key, "MODALIAS1" for the second modalias. This brings up the question of whether each key in uevent file is unique. If it's no unique, this may break may userspace.
[1] https://github.com/systemd/systemd/pull/18163
Kai-Heng
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