1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index ca13df854639..6ba8891e8efe 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2485,10 +2485,23 @@ static void blkback_changed(struct xenbus_device *dev,
                 break;
 
         case XenbusStateConnected:
-                if (dev->state != XenbusStateInitialised) {
+                /*
+                 * talk_to_blkback sets state to XenbusStateInitialised
+                 * and blkfront_connect sets it to XenbusStateConnected
+                 * (if connection went OK).
+                 *
+                 * If the backend (or toolstack) decides to poke at backend
+                 * state (and re-trigger the watch by setting the state repeatedly
+                 * to XenbusStateConnected (4)) we need to deal with this.
+                 * This is allowed as this is used to communicate to the guest
+                 * that the size of disk has changed!
+                 */
+                if ((dev->state != XenbusStateInitialised) &&
+                    (dev->state != XenbusStateConnected)) {
                         if (talk_to_blkback(dev, info))
                                 break;
                 }
+
                 blkfront_connect(info);
                 break;