The upstream commit that fixes this is:
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/net/ethernet/apm/xgene?id=b5d7a06906a4875524f5c61c0b312828bf6737de

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https://bugs.launchpad.net/bugs/1611399

Title:
  [SRU] xgene_enet: an extra interrupt may be pending for an interrupt
  controller that doesn't support irq_disable and hardware with level
  interrupt

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  For interrupt controller that doesn't support irq_disable and hardware
  with level interrupt, an extra interrupt may be pending. This patch fixes
  the issue by setting IRQ_DISABLE_UNLAZY flag for the interrupt line,
  as suggested by,

  'commit e9849777d0e2 ("genirq: Add flag to force mask in
           disable_irq[_nosync]()")'

  [Test Case]
  Run iperf on a merlin board to exercise the xgene_enet driver

  [Regression Risk]
  This commit only affects the xgene_enet driver

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