Do a complete cgminer restart if the ATI Display Library fails, as it does on windows after running for some time, when fanspeed reporting fails.

adl.c

@@ -679,6 +679,16 @@ int gpu_fanpercent(int gpu)
 	lock_adl();
 	ret = __gpu_fanpercent(ga);
 	unlock_adl();
+	if (unlikely(ga->has_fanspeed && ret == -1)) {
+		applog(LOG_WARNING, "GPU %d stopped reporting fanspeed due to driver corruption", gpu);
+		if (opt_restart) {
+			applog(LOG_WARNING, "Restart enabled, will restart cgminer");
+			applog(LOG_WARNING, "You can disable this with the --no-restart option");
+			app_restart();
+		}
+		applog(LOG_WARNING, "Disabling fanspeed monitoring on this device");
+		ga->has_fanspeed = false;
+	}
 	return ret;
 }
 

miner.h

@@ -657,5 +657,6 @@ extern void tq_freeze(struct thread_q *tq);
 extern void tq_thaw(struct thread_q *tq);
 extern bool successful_connect;
 extern void adl(void);
+extern void app_restart(void);
 
 #endif /* __MINER_H__ */