David Dai had submitted a patch[1] to address a reported issue with e1000e calling pci_disable_msi without first freeing the interrupts. Looking over the issue it seems the problem was the fact that e1000e_down was being called in e1000_io_error_detected without calling e1000_free_irq, and this was resulting in e1000e_close skipping over the call to e1000e_down and e1000_free_irq.
The use of the __E1000_DOWN flag for the close test seems to have come from the runtime power management changes that were made some time ago. From what I can tell in the close path we should be disabling runtime power management via a call to pm_runtime_get_sync. As such we can remove the test for the __E1000_DOWN bit. However in comparing this with other drivers we do need to avoid freeing the IRQs more than once. So in order to address that I have copied the approach taken in igb and taken it a bit further so that we will always detach the interface and if the interface is up we will bring it down and free the IRQs. In addition we are able to reuse some of the power management code so I have taken the opportunity to merge those bits. [1]: https://lore.kernel.org/lkml/1570121672-12172-1-git-send-email-z...@linux.vnet.ibm.com/ --- Alexander Duyck (2): e1000e: Use rtnl_lock to prevent race conditions between net and pci/pm e1000e: Drop unnecessary __E1000_DOWN bit twiddling drivers/net/ethernet/intel/e1000e/netdev.c | 47 +++++++++++++--------------- 1 file changed, 22 insertions(+), 25 deletions(-) --
