Revert "When pinging a sick cpu, flush finish and then ping it in a separate thread in the hope it recovers, but without blocking code elsewhere."

This reverts commit a466942fd8.

main.c

@@ -3431,46 +3431,10 @@ static void *reinit_gpu(void *userdata)
 
 	return NULL;
 }
-
-static void *ping_gputhread(void *userdata)
-{
-	struct cgpu_info *cgpu = (struct cgpu_info *)userdata;
-	int gpu = cgpu->cpu_gpu;
-	struct thr_info *thr;
-	_clState *clState;
-	int thr_id;
-
-	for (thr_id = 0; thr_id < gpu_threads; thr_id ++) {
-		if (dev_from_id(thr_id) != gpu)
-			continue;
-
-		thr = &thr_info[thr_id];
-		clState = clStates[thr_id];
-		tq_push(thr->q, &ping);
-		applog(LOG_WARNING, "Attempting to flush command queue of thread %d", thr_id);
-		clFlush(clState->commandQueue);
-		clFinish(clState->commandQueue);
-		tq_push(thr->q, &ping);
-	}
-
-	return NULL;
-}
-
-static void ping_gpu(struct cgpu_info *cgpu)
-{
-	pthread_t ping_thread;
-
-	if (unlikely(pthread_create(&ping_thread, NULL, ping_gputhread, (void *)cgpu)))
-		applog(LOG_ERR, "Failed to create ping thread");
-}
 #else
 static void *reinit_gpu(void *userdata)
 {
 }
-
-static void ping_gpu(struct cgpu_info *cgpu)
-{
-}
 #endif
 
 static void reinit_device(struct cgpu_info *cgpu)
@@ -3583,7 +3547,7 @@ static void *watchdog_thread(void *userdata)
 				gpus[gpu].status = LIFE_SICK;
 				applog(LOG_ERR, "Thread %d idle for more than 60 seconds, GPU %d declared SICK!", i, gpu);
 				/* Sent it a ping, it might respond */
-				ping_gpu(thr->cgpu);
+				tq_push(thr->q, &ping);
 			} else if (now.tv_sec - thr->last.tv_sec > 300 && gpus[i].status == LIFE_SICK) {
 				gpus[gpu].status = LIFE_DEAD;
 				applog(LOG_ERR, "Thread %d idle for more than 5 minutes, GPU %d declared DEAD!", i, gpu);