From patchwork Tue Sep 27 13:00:38 2011
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Subject: [2/3] memory: Do not print empty PIO root
From: Jan Kiszka <jan.kiszka@siemens.com>
X-Patchwork-Id: 116601
Message-Id: <4E81C8F6.2060502@siemens.com>
To: Avi Kivity <avi@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel <qemu-devel@nongnu.org>
Date: Tue, 27 Sep 2011 15:00:38 +0200

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

---
memory.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/memory.c b/memory.c
index 4c190e5..24c5abd 100644
--- a/memory.c
+++ b/memory.c
@@ -1414,7 +1414,10 @@ void mtree_info(fprintf_function mon_printf, void *f)
         g_free(ml2);
     }
 
-    QTAILQ_INIT(&ml_head);
-    mon_printf(f, "I/O\n");
-    mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
+    if (address_space_io.root &&
+        !QTAILQ_EMPTY(&address_space_io.root->subregions)) {
+        QTAILQ_INIT(&ml_head);
+        mon_printf(f, "I/O\n");
+        mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
+    }
 }