From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Sat, 19 Sep 2009 00:13:41 +0000 (-0700)
Subject: xen/evtchn: remove spurious barrier
X-Git-Tag: firefly_0821_release~7613^2~3383^2^3~1^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1a1a17cddbfb1f81222b3f18ee8530c41fbc3b82;p=firefly-linux-kernel-4.4.55.git

xen/evtchn: remove spurious barrier

evtchn_unbind_from_user() is called under a lock, so there's no need to
worry about the ordering of unbind_from_irqhandler vs clearing the port
per-user data.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---

diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 72dc7f20c5ed..f79ac5ca3793 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -279,9 +279,6 @@ static void evtchn_unbind_from_user(struct per_user_data *u, int port)
 
 	unbind_from_irqhandler(irq, (void *)(unsigned long)port);
 
-	/* make sure we unbind the irq handler before clearing the port */
-	barrier();
-
 	set_port_user(port, NULL);
 }