[Xen-devel] [PATCH 07/18] mini-os: avoid crash if no console is provided

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 extras/mini-os/console/xencons_ring.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/extras/mini-os/console/xencons_ring.c 
b/extras/mini-os/console/xencons_ring.c
index 22fd618..14a8bd1 100644
--- a/extras/mini-os/console/xencons_ring.c
+++ b/extras/mini-os/console/xencons_ring.c
@@ -25,7 +25,10 @@ static inline void notify_daemon(struct consfront_dev *dev)
 
 static inline struct xencons_interface *xencons_interface(void)
 {
-    return mfn_to_virt(start_info.console.domU.mfn);
+    if (start_info.console.domU.evtchn)
+        return mfn_to_virt(start_info.console.domU.mfn);
+    else
+        return NULL;
 } 
  
 int xencons_ring_send_no_notify(struct consfront_dev *dev, const char *data, 
unsigned len)
@@ -38,6 +41,8 @@ int xencons_ring_send_no_notify(struct consfront_dev *dev, 
const char *data, uns
             intf = xencons_interface();
         else
             intf = dev->ring;
+    if (!intf)
+        return sent;
 
        cons = intf->out_cons;
        prod = intf->out_prod;
-- 
1.7.7.5


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