drivers: xen-blkfront: only talk_to_blkback() when in XenbusStateInitialising

Patch 69b91ede
"drivers: xen-blkback: delay pending_req allocation to connect_ring"
exposed an problem that Xen blkfront has. There is a race
with XenStored and the drivers such that we can see two:

vbd vbd-268440320: blkfront:blkback_changed to state 2.
vbd vbd-268440320: blkfront:blkback_changed to state 2.
vbd vbd-268440320: blkfront:blkback_changed to state 4.

state changes to XenbusStateInitWait ('2'). The end result is that
blkback_changed() receives two notify and calls twice setup_blkring().

While the backend driver may only get the first setup_blkring() which is
wrong and reads out-dated (or reads them as they are being updated
with new ring-ref values).

The end result is that the ring ends up being incorrectly set.

The other drivers in the tree have such checks already in.
Reported-and-Tested-by: Robert Butera <robert.butera@oracle.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/block/xen-blkfront.c

@@ -1951,6 +1951,8 @@ static void blkback_changed(struct xenbus_device *dev,
 
 	switch (backend_state) {
 	case XenbusStateInitWait:
+		if (dev->state != XenbusStateInitialising)
+			break;
 		if (talk_to_blkback(dev, info)) {
 			kfree(info);
 			dev_set_drvdata(&dev->dev, NULL);