iface-modem: close primary port during disable

src/mm-iface-modem.c

@@ -756,6 +756,7 @@ typedef enum {
     DISABLING_STEP_FIRST,
     DISABLING_STEP_FLASH_PORT,
     DISABLING_STEP_MODEM_POWER_DOWN,
+    DISABLING_STEP_CLOSE_PORT,
     DISABLING_STEP_LAST
 } DisablingStep;
 
@@ -908,6 +909,17 @@ interface_disabling_step (DisablingContext *ctx)
         /* Fall down to next step */
         ctx->step++;
 
+    case DISABLING_STEP_CLOSE_PORT:
+        /* While the modem is enabled ports are kept open, so we need to close
+         * them when the modem gets disabled. As this (should) be the last
+         * closing in order to get it really closed (open count = 1), it should
+         * be safe to check whether they are really open before trying to close.
+         */
+        if (mm_serial_port_is_open (MM_SERIAL_PORT (ctx->primary)))
+            mm_serial_port_close (MM_SERIAL_PORT (ctx->primary));
+        /* Fall down to next step */
+        ctx->step++;
+
     case DISABLING_STEP_LAST:
         /* We are done without errors! */
         g_simple_async_result_set_op_res_gboolean (ctx->result, TRUE);