[Qemu-devel] [PATCH 2/8] chr: check to see if front end has registered a read function

From: Anthony Liguori <aliguori@us.ibm.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Weil <sw@weilnetz.de>,
	Anthony Liguori <aliguori@us.ibm.com>, Alex Graf <agraf@suse.de>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: [Qemu-devel] [PATCH 2/8] chr: check to see if front end has registered a read function
Date: Sun, 26 Feb 2012 17:46:29 -0600	[thread overview]
Message-ID: <1330299995-8688-3-git-send-email-aliguori@us.ibm.com> (raw)
In-Reply-To: <1330299995-8688-1-git-send-email-aliguori@us.ibm.com>

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 qemu-char.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/qemu-char.c b/qemu-char.c
index 5b2b35e..22bfb29 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -160,7 +160,9 @@ int qemu_chr_be_can_write(CharDriverState *s)
 
 void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len)
 {
-    s->chr_read(s->handler_opaque, buf, len);
+    if (s->chr_read) {
+        s->chr_read(s->handler_opaque, buf, len);
+    }
 }
 
 int qemu_chr_fe_get_msgfd(CharDriverState *s)
-- 
1.7.4.1
