From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 14 May 2012 10:06:09 +0000 (+0200)
Subject: x86/irq: fix locking for c/s 24707:96987c324a4f debugging code
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=c3ea8941686338c35ebf7e131378a6a5bcb1f33c;p=people%2Fvhanquez%2Fxen-unstable.git

x86/irq: fix locking for c/s 24707:96987c324a4f debugging code

Without this, dump_irqs() may try to acquire the lock the caller is
currently holding.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 425af20387..2fc676b716 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -668,6 +668,7 @@ void irq_move_cleanup_interrupt(struct cpu_user_regs *regs)
             {
                 if ( unlikely(!test_bit(vector, desc->arch.used_vectors)) )
                 {
+                    spin_unlock(&desc->lock);
                     bitmap_scnlistprintf(keyhandler_scratch,
                                          sizeof(keyhandler_scratch),
                                          desc->arch.used_vectors->_bits,