From: Jan Beulich <jbeulich@suse.com>
Date: Wed, 9 Nov 2011 09:36:20 +0000 (+0100)
Subject: x86/MSI: fix dump_msi() after c/s 24068:6928172f7ded
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e501d9f69bfa8dda16fba164dac7922154435c2d;p=xen.git

x86/MSI: fix dump_msi() after c/s 24068:6928172f7ded

The function must not blindly take the lock on IRQ descriptors.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index bbed64a47c..2d860069c8 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -1076,6 +1076,9 @@ static void dump_msi(unsigned char key)
         unsigned long flags;
         char type;
 
+        if ( !irq_desc_initialized(desc) )
+            continue;
+
         spin_lock_irqsave(&desc->lock, flags);
 
         entry = desc->msi_desc;