Add more comments explaining how sleep time equals wait time and simplify the comparison.
diff --git a/driver-bitforce.c b/driver-bitforce.c
index 914a07f..a13d862 100644
--- a/driver-bitforce.c
+++ b/driver-bitforce.c
@@ -368,12 +368,14 @@ static uint64_t bitforce_get_result(struct thr_info *thr, struct work *work)
if (!pdevbuf[0]) /* Only return if we got nothing after timeout - there still may be results */
return 1;
} else if (!strncasecmp(pdevbuf, "N", 1)) {/* Hashing complete (NONCE-FOUND or NO-NONCE) */
- /* Simple timing adjustment */
+ /* Simple timing adjustment. Allow a few polls to cope with
+ * OS timer delays being variably reliable. wait_ms will
+ * always equal sleep_ms when we've waited greater than or
+ * equal to the result return time.*/
delay_time_ms = bitforce->sleep_ms;
if (bitforce->wait_ms > bitforce->sleep_ms + (WORK_CHECK_INTERVAL_MS * 2))
bitforce->sleep_ms += (bitforce->wait_ms - bitforce->sleep_ms) / 2;
- else if (bitforce->wait_ms > bitforce->sleep_ms - WORK_CHECK_INTERVAL_MS &&
- bitforce->wait_ms <= bitforce->sleep_ms)
+ else if (bitforce->wait_ms == bitforce->sleep_ms)
bitforce->sleep_ms -= BITFORCE_CHECK_INTERVAL_MS;
if (delay_time_ms != bitforce->sleep_ms)