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
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https://bugs.launchpad.net/bugs/2059310
Title:
mlxbf_gige: call request_irq() after NAPI initialized
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