[PATCH] nvme-pci: fix resume after AER recovery

[Keith Busch]

On Mon, Jan 30, 2023 at 11:14:49AM +0100, Christoph Hellwig wrote:
> All I/O on a nvme controllers hangs after injecting a malformed TLP error
> using aer-inject with an error file like:
> 
> --- snip ---
> AER
> PCI_ID WWWW:XX.YY.Z
> UNCOR_STATUS COMP_TIME
> HEADER_LOG 0 1 2 3
> --- snip ---
> 
> This is because in this case the ->resume method will be called after
> ->error_injected and not ->slot_reset, leaving the controller in disabled
> state and the queue frozen.  Fix this by doing a controller reset to
> resume as well.

Why isn't slot_reset being called after error_detected? Driver should be
returning "RESULT_NEEDS_RESET", which should have the pcie error handling
always invoke the slot_reset callback.