Ticket #500: Patch_rtems-4.6.0_cpukit_libcsupport_src_termios_c.diff

cpukit/libcsupport/src/termios.c

@@ -1039 +1038 @@
 static rtems_status_code
 fillBufferQueue (struct rtems_termios_tty *tty)
 {
+        rtems_interrupt_level level;
         rtems_interval timeout = tty->rawInBufSemaphoreFirstTimeout;
         rtems_status_code sc;
         int               wait = (int)1;
@@ -1047 +1047 @@
                 /*
                  * Process characters read from raw queue
                  */
-                while (tty->rawInBuf.Head != tty->rawInBuf.Tail) {
+                while ((tty->rawInBuf.Head != tty->rawInBuf.Tail) && (tty->ccount < (CBUFSIZE-1))) {
                         unsigned char c;
                         unsigned int newHead;
 
@@ -1057 +1057 @@
                         if(((tty->rawInBuf.Tail-newHead+tty->rawInBuf.Size)
                             % tty->rawInBuf.Size)
                            < tty->lowwater) {
+                          /* Disable interrupt to reset FL_IREQXOF and FL_IRTSOFF without been interrupted */
+                          rtems_interrupt_disable(level);
                           tty->flow_ctrl &= ~FL_IREQXOF;
                           /* if tx stopped and XON should be sent... */
                           if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
@@ -1075 +1077 @@
                               tty->device.startRemoteTx(tty->minor);
                             }
                           }
+                          /* reenable interrupts */
+                          rtems_interrupt_enable(level);
                         }
 
                         /* continue processing new character */