Revert "Revert "Change BFL driver thread initialising to a constant 100ms delay between devices instead of a random arrangement.""

This reverts commit 89e613b943.

Leave the delay between each device initialising.

driver-bitforce.c

@@ -530,9 +530,9 @@ static bool bitforce_thread_init(struct thr_info *thr)
 	struct cgpu_info *bitforce = thr->cgpu;
 	unsigned int wait;
 
-	/* Pause each new thread a random time between 0-100ms 
-	so the devices aren't making calls all at the same time. */
-	wait = (rand() * MAX_START_DELAY_US)/RAND_MAX;
+	/* Pause each new thread at least 100ms between initialising
+	 * so the devices aren't making calls all at the same time. */
+	wait = thr->id * MAX_START_DELAY_US;
 	applog(LOG_DEBUG, "BFL%i: Delaying start by %dms", bitforce->device_id, wait / 1000);
 	usleep(wait);