Public bug reported: SRU Justification:
[Impact] The mlxbf_gige driver encounters a NULL pointer exception in mlxbf_gige_open() when kdump is enabled. The exception happens because there is a pending RX interrupt before the call to request_irq(RX IRQ) executes. Then, the RX IRQ handler fires immediately after this request_irq() completes. The RX IRQ handler runs "napi_schedule()" before NAPI is fully initialized via "netif_napi_add()" and "napi_enable()", both which happen later in the open() logic. [Fix] The logic in mlxbf_gige_open() must fully initialize NAPI before any calls to request_irq() execute. [Test Case] * Boot BF platform and bring up "oob_net0" interface * Enable kdump completely * Trigger kdump via "echo c > /proc/sysrq-trigger" * There should be no exceptions from mlxbf_gige driver [Regression Potential] There is low potential for regression as this brings in upstream content. [Other] None ** Affects: linux-bluefield (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/2059310 Title: mlxbf_gige: call request_irq() after NAPI initialized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-bluefield/+bug/2059310/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs