Sleep in avalon send task on return to the function to allow other code to work during the sleep period.

driver-avalon.c

@@ -142,13 +142,12 @@ static int avalon_write(struct cgpu_info *avalon, char *buf, ssize_t len, int ep
 	return AVA_SEND_OK;
 }
 
-static int avalon_send_task(const struct avalon_task *at, struct cgpu_info *avalon)
+static int avalon_send_task(const struct avalon_task *at, struct cgpu_info *avalon,
+			    struct avalon_info *info)
 
 {
 	uint8_t buf[AVALON_WRITE_SIZE + 4 * AVALON_DEFAULT_ASIC_NUM];
 	int delay, ret, i, ep = C_AVALON_TASK;
-	struct avalon_info *info;
-	cgtimer_t ts_start;
 	uint32_t nonce_range;
 	size_t nr_len;
 
@@ -189,7 +188,6 @@ static int avalon_send_task(const struct avalon_task *at, struct cgpu_info *aval
 	tt |= ((buf[4] & 0x80) ? (1 << 0) : 0);
 	buf[4] = tt;
 #endif
-	info = avalon->device_data;
 	delay = nr_len * 10 * 1000000;
 	delay = delay / info->baud;
 	delay += 4000;
@@ -202,11 +200,14 @@ static int avalon_send_task(const struct avalon_task *at, struct cgpu_info *aval
 		applog(LOG_DEBUG, "Avalon: Sent(%u):", (unsigned int)nr_len);
 		hexdump(buf, nr_len);
 	}
-	cgsleep_prepare_r(&ts_start);
+	/* Sleep from the last time we sent data */
+	cgsleep_us_r(&info->cgsent, info->send_delay);
+
+	cgsleep_prepare_r(&info->cgsent);
 	ret = avalon_write(avalon, (char *)buf, nr_len, ep);
-	cgsleep_us_r(&ts_start, delay);
 
-	applog(LOG_DEBUG, "Avalon: Sent: Buffer delay: %dus", delay);
+	applog(LOG_DEBUG, "Avalon: Sent: Buffer delay: %dus", info->send_delay);
+	info->send_delay = delay;
 
 	return ret;
 }
@@ -319,7 +320,7 @@ static int avalon_reset(struct cgpu_info *avalon, bool initial)
 			 AVALON_DEFAULT_FREQUENCY);
 
 	wait_avalon_ready(avalon);
-	ret = avalon_send_task(&at, avalon);
+	ret = avalon_send_task(&at, avalon, info);
 	if (unlikely(ret == AVA_SEND_ERROR))
 		return -1;
 
@@ -560,7 +561,7 @@ static void avalon_idle(struct cgpu_info *avalon, struct avalon_info *info)
 		avalon_init_task(&at, 0, 0, info->fan_pwm, info->timeout,
 				 info->asic_count, info->miner_count, 1, 1,
 				 info->frequency);
-		avalon_send_task(&at, avalon);
+		avalon_send_task(&at, avalon, info);
 	}
 	applog(LOG_WARNING, "%s%i: Idling %d miners", avalon->drv->name, avalon->device_id, i);
 	wait_avalon_ready(avalon);
@@ -1148,7 +1149,7 @@ static void *avalon_send_tasks(void *userdata)
 				avalon_reset_auto(info);
 			}
 
-			ret = avalon_send_task(&at, avalon);
+			ret = avalon_send_task(&at, avalon, info);
 
 			if (unlikely(ret == AVA_SEND_ERROR)) {
 				/* Send errors are fatal */

driver-avalon.h

@@ -144,8 +144,10 @@ struct avalon_info {
 	pthread_mutex_t lock;
 	pthread_mutex_t qlock;
 	cgsem_t qsem;
-	int nonces;
+	cgtimer_t cgsent;
+	int send_delay;
 
+	int nonces;
 	int auto_queued;
 	int auto_nonces;
 	int auto_hw;