Public bug reported: On an arm64 laptop whose embedded controller FF-A partition declares 38 notifications, the EC service driver fails to probe at boot. AC adapter and battery updates, lid events, and hotkeys are consequently lost.
The arm_ffa notifier callbacks use a 64-bucket hash keyed by notification ID, but the callback records do not retain or compare that ID during lookup. IDs 2 and 36 collide, so registering notification 36 returns -EINVAL as a false duplicate. The lookup used for delivery can also select a callback for the wrong notification ID. Store the notification ID in each callback record and compare it in all notifier lookup paths. This fix is proposed for both kernel branches: linux-nvidia: https://github.com/NVIDIA/NV-Kernels/pull/653 linux-nvidia-bos: https://github.com/NVIDIA/NV-Kernels/pull/654 ** Affects: linux-nvidia-bos (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2171426 Title: arm_ffa notification ID collision prevents EC service from probing To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-nvidia-bos/+bug/2171426/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
