From: Hans de Goede <hdegoede@redhat.com>
Date: Sat, 19 Nov 2011 09:22:47 +0000 (+0100)
Subject: usb-redir: Don't try to write to the chardev after a close event
X-Git-Tag: qemu-xen-4.3.0-rc1~1956
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=c1b71a1df682fc49f91218130b1837d6d91dcb57;p=qemu-upstream-4.6-testing.git

usb-redir: Don't try to write to the chardev after a close event

Since we handle close async in a bh, do_write and thus write can get
called after receiving a close event. This patch adds a check to
the usb-redir write callback to not call qemu_chr_fe_write on a closed
backend.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---

diff --git a/usb-redir.c b/usb-redir.c
index 24fdd31ce..fb91c926a 100644
--- a/usb-redir.c
+++ b/usb-redir.c
@@ -225,6 +225,10 @@ static int usbredir_write(void *priv, uint8_t *data, int count)
 {
     USBRedirDevice *dev = priv;
 
+    if (!dev->cs->opened) {
+        return 0;
+    }
+
     return qemu_chr_fe_write(dev->cs, data, count);
 }