3 files changed, 16 insertions, 1 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 4497ff84f64a..dfe61afe676a 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -88,6 +88,7 @@ struct blkfront_info
         struct blk_shadow shadow[BLK_RING_SIZE];
         unsigned long shadow_free;
         int feature_barrier;
+        int is_ready;
 
         /**
          * The number of people holding this device open.  We won't allow a
@@ -839,6 +840,8 @@ static void blkfront_connect(struct blkfront_info *info)
         spin_unlock_irq(&blkif_io_lock);
 
         add_disk(info->gd);
+
+        info->is_ready = 1;
 }
 
 /**
@@ -931,6 +934,13 @@ static int blkfront_remove(struct xenbus_device *dev)
         return 0;
 }
 
+static int blkfront_is_ready(struct xenbus_device *dev)
+{
+        struct blkfront_info *info = dev->dev.driver_data;
+
+        return info->is_ready;
+}
+
 static int blkif_open(struct inode *inode, struct file *filep)
 {
         struct blkfront_info *info = inode->i_bdev->bd_disk->private_data;
@@ -977,6 +987,7 @@ static struct xenbus_driver blkfront = {
         .remove = blkfront_remove,
         .resume = blkfront_resume,
         .otherend_changed = backend_changed,
+        .is_ready = blkfront_is_ready,
 };
 
 static int __init xlblk_init(void)
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 4750de316ad3..88fc5ec665f5 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -846,6 +846,7 @@ static int is_disconnected_device(struct device *dev, void *data)
 {
         struct xenbus_device *xendev = to_xenbus_device(dev);
         struct device_driver *drv = data;
+        struct xenbus_driver *xendrv;
 
         /*
          * A device with no driver will never connect. We care only about
@@ -858,7 +859,9 @@ static int is_disconnected_device(struct device *dev, void *data)
         if (drv && (dev->driver != drv))
                 return 0;
 
-        return (xendev->state != XenbusStateConnected);
+        xendrv = to_xenbus_driver(dev->driver);
+        return (xendev->state != XenbusStateConnected ||
+                (xendrv->is_ready && !xendrv->is_ready(xendev)));
 }
 
 static int exists_disconnected_device(struct device_driver *drv)
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index 6f7c290651ae..6369d89c25d5 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -97,6 +97,7 @@ struct xenbus_driver {
         int (*uevent)(struct xenbus_device *, char **, int, char *, int);
         struct device_driver driver;
         int (*read_otherend_details)(struct xenbus_device *dev);
+        int (*is_ready)(struct xenbus_device *dev);
 };
 
 static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv)