commit 377228accbbb8b9738f615d791aa803f41c067e0 upstream.

There were a couple cases where the ITR value generated via the adaptive
ITR scheme could exceed 126. This resulted in the value becoming either 0
or something less than 10. Switching back and forth between a value less
than 10 and a value greater than 10 can cause issues as certain hardware
features such as RSC to not function well when the ITR value has dropped
that low.

CC: stable@vger.kernel.org
Fixes: b4ded832 ("ixgbe: Update adaptive ITR algorithm")
Reported-by: NGregg Leventhal <gleventhal@janestreet.com>
Signed-off-by: NAlexander Duyck <alexander.h.duyck@linux.intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>