From c9a425bae33a74ad3ee8de02dc2981bd934b5b5e Mon Sep 17 00:00:00 2001
From: Kip Macy <kmacy@FreeBSD.org>
Date: Sun, 21 Feb 2010 01:12:18 +0000
Subject: [PATCH] don't hold spin lock across free

---
 sys/xen/evtchn/evtchn_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/xen/evtchn/evtchn_dev.c b/sys/xen/evtchn/evtchn_dev.c
index 4253d8a1700..7e21d7a07be 100644
--- a/sys/xen/evtchn/evtchn_dev.c
+++ b/sys/xen/evtchn/evtchn_dev.c
@@ -302,11 +302,11 @@ evtchn_close(struct cdev *dev, int flag, int otyp, struct thread *td __unused)
 {
 	int i;
 
-	mtx_lock_spin(&lock);
 	if (ring != NULL) {
 		free(ring, M_DEVBUF);
 		ring = NULL;
 	}
+	mtx_lock_spin(&lock);
 	for ( i = 0; i < NR_EVENT_CHANNELS; i++ )
 		if ( synch_test_and_clear_bit(i, &bound_ports[0]) )
 			mask_evtchn(i);