monitor: Avoid readline functions in QMP

The monitor_read_command() function is readline specific
and should only be used when readline is available.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 183e6e525764d5c4978e37b42dc2cde0b0ffcfec)

diff --git a/monitor.c b/monitor.c
index 920ccff58419e01e7c199c4cc6fdc662e8f9aa28..b518cc4b555e268664a5c738c9c524510b71d66d 100644 (file)
--- a/monitor.c
+++ b/monitor.c
@@ -140,6 +140,9 @@ static inline int monitor_ctrl_mode(const Monitor *mon)
 
 static void monitor_read_command(Monitor *mon, int show_prompt)
 {
+    if (!mon->rs)
+        return;
+
     readline_start(mon->rs, "(qemu) ", 0, monitor_command_cb, NULL);
     if (show_prompt)
         readline_show_prompt(mon->rs);