---

yaml --- r: 208285 b: refs/heads/master c: 1396174 h: refs/heads/master i: 208283: ee70c9b v: v3
git-mirror · Aug 7, 2010 · c231797 · c231797
1 parent d697c3b
commit c231797
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Showing 2 changed files with 25 additions and 8 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b70f5fa043b318659c936d8c3c696250e6528944
+refs/heads/master: 139617437aff1f0d3b57c2d7cc60e60efc8fe6c3
diff --git a/trunk/drivers/block/xen-blkfront.c b/trunk/drivers/block/xen-blkfront.c
@@ -1118,16 +1118,33 @@ static int blkfront_is_ready(struct xenbus_device *dev)
 
 static int blkif_open(struct block_device *bdev, fmode_t mode)
 {
-	struct blkfront_info *info = bdev->bd_disk->private_data;
-
-	if (!info->xbdev)
-		return -ENODEV;
+	struct gendisk *disk = bdev->bd_disk;
+	struct blkfront_info *info;
+	int err = 0;
 
 	lock_kernel();
-	info->users++;
-	unlock_kernel();
 
-	return 0;
+	info = disk->private_data;
+	if (!info) {
+		/* xbdev gone */
+		err = -ERESTARTSYS;
+		goto out;
+	}
+
+	mutex_lock(&info->mutex);
+
+	if (!info->gd)
+		/* xbdev is closed */
+		err = -ERESTARTSYS;
+
+	mutex_unlock(&info->mutex);
+
+	if (!err)
+		++info->users;
+
+	unlock_kernel();
+out:
+	return err;
 }
 
 static int blkif_release(struct gendisk *disk, fmode_t mode)