tools: kwboot: Check for return value of kwboot_tty_send() and tcflush()

Failure of kwboot_tty_send() and tcflush() functions is fatal, it does not
make sense to continue. So return error back to the caller like in other
places where are called these functions.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 2d2d545..5a7c53c 100644 (file)
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -740,10 +740,8 @@ kwboot_bootmsg(int tty, void *msg)
 
                for (count = 0; count < 128; count++) {
                        rc = kwboot_tty_send(tty, msg, 8, 0);
-                       if (rc) {
-                               usleep(msg_req_delay * 1000);
-                               continue;
-                       }
+                       if (rc)
+                               break;
                }
 
                rc = kwboot_tty_recv(tty, &c, 1, msg_rsp_timeo);
@@ -772,11 +770,19 @@ kwboot_bootmsg(int tty, void *msg)
         */
 
        /* flush output queue with remaining boot message patterns */
-       tcflush(tty, TCOFLUSH);
+       rc = tcflush(tty, TCOFLUSH);
+       if (rc) {
+               perror("Failed to flush output queue");
+               return rc;
+       }
 
        /* send one xmodem packet with 0xff bytes to force BootROM to re-sync */
        memset(&block, 0xff, sizeof(block));
-       kwboot_tty_send(tty, &block, sizeof(block), 0);
+       rc = kwboot_tty_send(tty, &block, sizeof(block), 0);
+       if (rc) {
+               perror("Failed to send sync sequence");
+               return rc;
+       }
 
        /*
         * Sending 132 bytes via 115200B/8-N-1 takes 11.45 ms, reading 132 bytes
@@ -785,7 +791,11 @@ kwboot_bootmsg(int tty, void *msg)
        usleep(30 * 1000);
 
        /* flush remaining NAK replies from input queue */
-       tcflush(tty, TCIFLUSH);
+       rc = tcflush(tty, TCIFLUSH);
+       if (rc) {
+               perror("Failed to flush input queue");
+               return rc;
+       }
 
        return 0;
 }
@@ -805,10 +815,8 @@ kwboot_debugmsg(int tty, void *msg)
                        break;
 
                rc = kwboot_tty_send(tty, msg, 8, 0);
-               if (rc) {
-                       usleep(msg_req_delay * 1000);
-                       continue;
-               }
+               if (rc)
+                       break;
 
                rc = kwboot_tty_recv(tty, buf, 16, msg_rsp_timeo);