From 2d6c1ef40f3678ab47a4d14fb5dadaa486bfcda6 Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@redhat.com>
Date: Thu, 10 Feb 2011 12:55:20 +0530
Subject: char: Prevent multiple devices opening same chardev

Prevent:

-chardev socket,path=/tmp/foo,server,nowait,id=c0 \
-device virtserialport,chardev=c0,id=vs0 \
-device virtserialport,chardev=c0,id=vs1

Reported-by: Mike Cao <bcao@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 qemu-char.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'qemu-char.c')

diff --git a/qemu-char.c b/qemu-char.c
index cad35d7..c4557c3 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -197,6 +197,10 @@ void qemu_chr_add_handlers(CharDriverState *s,
                            IOEventHandler *fd_event,
                            void *opaque)
 {
+    if (!opaque) {
+        /* chr driver being released. */
+        s->assigned = 0;
+    }
     s->chr_can_read = fd_can_read;
     s->chr_read = fd_read;
     s->chr_event = fd_event;
-- 
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