avalon_read should not loop but just return whatever it has succeeded in reading.

driver-avalon.c

@@ -229,23 +229,20 @@ static bool avalon_decode_nonce(struct thr_info *thr, struct cgpu_info *avalon,
 static int avalon_read(struct cgpu_info *avalon, char *buf, ssize_t len)
 {
 	ssize_t aread = 0;
-
-	while (len > 0) {
 	int amount, err, offset, cp;
 	char readbuf[AVALON_FTDI_READSIZE];
 
-		err = usb_read_once_timeout(avalon, readbuf, AVALON_FTDI_READSIZE,
-					    &amount, AVALON_READ_TIMEOUT,
-					    C_AVALON_READ);
+	err = usb_read_once_timeout(avalon, readbuf, len, &amount,
+				    AVALON_READ_TIMEOUT, C_AVALON_READ);
 	if (err && err != LIBUSB_ERROR_TIMEOUT) {
 		applog(LOG_WARNING, "%s%i: Get avalon read got err %d",
 			avalon->drv->name, avalon->device_id, err);
 		nmsleep(AVALON_READ_TIMEOUT);
-			continue;
+		return 0;
 	}
 
 	if (amount < 3)
-			continue;
+		return 0;
 
 	offset = 2;
 	do {
@@ -257,9 +254,8 @@ static int avalon_read(struct cgpu_info *avalon, char *buf, ssize_t len)
 		amount -= cp + 2;
 		offset += 64;
 	} while (amount > 2);
-	}
 
-	return AVA_GETS_OK;
+	return aread;
 }
 
 /* Wait until the ftdi chip returns a CTS saying we can send more data. The