IB/hfi1: Ignore link downgrade with 0 lanes
Versions of the 8051 firmware < 0.38 may report a link failure as a link downgrade with a width of 0 followed by a link down notification. Ignore the zero width downgrade notification - the driver should follow the link down path. Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com> Signed-off-by: Dean Luick <dean.luick@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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