119 /tmp/loop_offbyone.c
BUILD_OK
stimulus                               shipped gate   fixed gate     expected
DONE on 1st poll     (rc=0)            0              0              0
DONE on 501st poll   (rc=500)          0              0              0
DONE on 1000th poll  (rc=999)          0              0              0
DONE on 1001st poll  (rc=1000)  <-- last body -5             0              0   BUG: completed xfer misreported as -EIO
never DONE (true HW timeout)           -5             -5             -5

RESULT: shipped loop misclassifies a DONE-on-last-poll transfer as -EIO (radeon_dp_auxch.c:160).
EXIT=1