[Xen-devel] [PATCH] xenbus: check return value of xenbus_scanf()

["Jan Beulich" <JBeulich@xxxxxxxx>]

Set backend state to unknown when unsuccessful.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe_frontend.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 4.7-rc6-xenbus_scanf.orig/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ 4.7-rc6-xenbus_scanf/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -342,7 +342,9 @@ static int backend_state;
 static void xenbus_reset_backend_state_changed(struct xenbus_watch *w,
                                        const char **v, unsigned int l)
 {
-       xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i", &backend_state);
+       if (xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i",
+                        &backend_state) != 1)
+               backend_state = XenbusStateUnknown;
        printk(KERN_DEBUG "XENBUS: backend %s %s\n",
                        v[XS_WATCH_PATH], xenbus_strstate(backend_state));
        wake_up(&backend_state_wq);




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