From 124212624d420efbdd2eb986a268684a9b97fcb6 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sun, 28 Jul 2019 07:39:55 -0600
Subject: [PATCH] net:  Minor fix in error checking in TCP/UDP Tx drain logic

---
 net/tcp/tcp_conn.c    | 2 +-
 net/tcp/tcp_txdrain.c | 4 ++--
 net/udp/udp_txdrain.c | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/tcp/tcp_conn.c b/net/tcp/tcp_conn.c
index e935957ce6..1b0be8e829 100644
--- a/net/tcp/tcp_conn.c
+++ b/net/tcp/tcp_conn.c
@@ -747,7 +747,7 @@ void tcp_free(FAR struct tcp_conn_s *conn)
 #endif
 
   /* Because g_free_tcp_connections is accessed from user level and event
-   * processing logic, it is necessary to keep the newtork locked during this
+   * processing logic, it is necessary to keep the network locked during this
    * operation.
    */
 
diff --git a/net/tcp/tcp_txdrain.c b/net/tcp/tcp_txdrain.c
index 96d9171e40..781f3707e6 100644
--- a/net/tcp/tcp_txdrain.c
+++ b/net/tcp/tcp_txdrain.c
@@ -65,7 +65,7 @@
  *   Called with the write buffers have all been sent.
  *
  * Input Parameters:
- *   arg     - The semaphore that will wake up tcp_txdrain
+ *   arg     - The notifier entry.
  *
  * Returned Value:
  *   None.
@@ -178,7 +178,7 @@ int tcp_txdrain(FAR struct socket *psock,
             {
               ret = net_timedwait(&waitsem, abstime);
             }
-          while (ret == EINTR);
+          while (ret == -EINTR);
 
           /* Tear down the disconnect notifier */
 
diff --git a/net/udp/udp_txdrain.c b/net/udp/udp_txdrain.c
index ef20506e17..ffbc0ba2d1 100644
--- a/net/udp/udp_txdrain.c
+++ b/net/udp/udp_txdrain.c
@@ -144,7 +144,7 @@ int udp_txdrain(FAR struct socket *psock,
         {
           ret = net_timedwait(&waitsem, abstime);
         }
-      while (ret == EINTR);
+      while (ret == -EINTR);
 
       /* Tear down the notifier (in case we timed out or were canceled) */