From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Fri, 6 Feb 2009 21:38:56 +0000 (-0800)
Subject: x86, xen: do multicall callbacks with interrupts disabled
X-Git-Tag: firefly_0821_release~14004^2~37^2~2^7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c99608637eac8834d830496c462c054137772122;p=firefly-linux-kernel-4.4.55.git

x86, xen: do multicall callbacks with interrupts disabled

We can't call the callbacks after enabling interrupts, as we may get a
nested multicall call, which would cause a great deal of havok.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 6cffd5532b91..8bff7e7c290b 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -170,8 +170,6 @@ void xen_mc_flush(void)
 	} else
 		BUG_ON(b->argidx != 0);
 
-	local_irq_restore(flags);
-
 	for (i = 0; i < b->cbidx; i++) {
 		struct callback *cb = &b->callbacks[i];
 
@@ -179,6 +177,8 @@ void xen_mc_flush(void)
 	}
 	b->cbidx = 0;
 
+	local_irq_restore(flags);
+
 	WARN_ON(ret);
 }