[Xen-changelog] [xen-unstable] x86/irq: fix locking for c/s 24707:96987c324a4f debugging code

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1336989969 -7200
# Node ID 7fdefd89cd86f5664526aef2b4015aaddba2c54a
# Parent  cc7a054a5a27bbb75a9b83d3c62ed6094c209e66
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@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---


diff -r cc7a054a5a27 -r 7fdefd89cd86 xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c        Mon May 14 12:04:27 2012 +0200
+++ b/xen/arch/x86/irq.c        Mon May 14 12:06:09 2012 +0200
@@ -668,6 +668,7 @@ void irq_move_cleanup_interrupt(struct c
             {
                 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,

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