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[068/139] xen: close evtchn port if binding to irq fails

Message ID 1362062689-2567-69-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques Feb. 28, 2013, 2:43 p.m. UTC 
3.5.7.7 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Liu <wei.liu2@citrix.com>

commit e7e44e444876478d50630f57b0c31d29f6725020 upstream.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/xen/evtchn.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index b1f60a0..b2db77e 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -269,6 +269,14 @@  static int evtchn_bind_to_user(struct per_user_data *u, int port)
 				       u->name, (void *)(unsigned long)port);
 	if (rc >= 0)
 		rc = evtchn_make_refcounted(port);
+	else {
+		/* bind failed, should close the port now */
+		struct evtchn_close close;
+		close.port = port;
+		if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
+			BUG();
+		set_port_user(port, NULL);
+	}
 
 	return rc;
 }
@@ -277,6 +285,8 @@  static void evtchn_unbind_from_user(struct per_user_data *u, int port)
 {
 	int irq = irq_from_evtchn(port);
 
+	BUG_ON(irq < 0);
+
 	unbind_from_irqhandler(irq, (void *)(unsigned long)port);
 
 	set_port_user(port, NULL);