diff --git a/src/ckpool.c b/src/ckpool.c
index a5b32411..5c156f0a 100644
--- a/src/ckpool.c
+++ b/src/ckpool.c
@@ -512,6 +512,10 @@ void empty_buffer(connsock_t *cs)
 	cs->buflen = cs->bufofs = 0;
 }
 
+/* If there is any cs->buflen it implies a full line was received on the last
+ * pass through read_socket_line and subsequently processed, leaving
+ * unprocessed data beyond cs->bufofs. Otherwise a zero buflen means there is
+ * only unprocessed data of bufos length. */
 static void clear_bufline(connsock_t *cs)
 {
 	if (unlikely(!cs->buf))
@@ -522,8 +526,7 @@ static void clear_bufline(connsock_t *cs)
 		cs->bufofs = cs->buflen;
 		cs->buflen = 0;
 		cs->buf[cs->bufofs] = '\0';
-	} else
-		cs->bufofs = 0;
+	}
 }
 
 static void add_buflen(connsock_t *cs, const char *readbuf, const int len)
@@ -571,7 +574,9 @@ static int recv_available(connsock_t *cs)
 
 /* Read from a socket into cs->buf till we get an '\n', converting it to '\0'
  * and storing how much extra data we've received, to be moved to the beginning
- * of the buffer for use on the next receive. */
+ * of the buffer for use on the next receive. Returns length of the line if a
+ * whole line is received, zero if none/some data is received without an EOL
+ * and -1 on error. */
 int read_socket_line(connsock_t *cs, float *timeout)
 {
 	bool proxy = cs->ckp->proxy;
diff --git a/src/generator.c b/src/generator.c
index 5de773a8..98a5c185 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -1949,11 +1949,8 @@ static void *passthrough_recv(void *arg)
 		 * process. Possibly parse parameters sent by upstream pool
 		 * here */
 		if (likely(ret > 0)) {
-			if (strchr(cs->buf, '\n')) {
-				LOGDEBUG("Passthrough recv received upstream msg: %s", cs->buf);
-				send_proc(ckp->connector, cs->buf);
-			} else
-				LOGDEBUG("Passthrough recv received partial message");
+			LOGDEBUG("Passthrough recv received upstream msg: %s", cs->buf);
+			send_proc(ckp->connector, cs->buf);
 		} else if (ret < 0) {
 			/* Read failure */
 			LOGWARNING("Passthrough %d:%s failed to read_socket_line in passthrough_recv, attempting reconnect",
@@ -1961,7 +1958,7 @@ static void *passthrough_recv(void *arg)
 			alive = proxi->alive = false;
 			Close(cs->fd);
 			reconnect_generator(ckp);
-		} else /* Idle, likely no clients */
+		} else /* No messages during timeout */
 			LOGDEBUG("Passthrough %d:%s no messages received", proxi->id, proxi->url);
 		cksem_post(&cs->sem);
 	}