On Thu, Aug 05, 2021 at 12:00:11AM -0700, longli@linuxonhyperv.com wrote:

+static int az_blob_create_device(struct az_blob_device *dev)
+{
+	int ret;
+	struct dentry *debugfs_root;
+
+	dev->misc.minor	= MISC_DYNAMIC_MINOR,
+	dev->misc.name	= "azure_blob",
+	dev->misc.fops	= &az_blob_client_fops,
+
+	ret = misc_register(&dev->misc);
+	if (ret)
+		return ret;
+
+	debugfs_root = debugfs_create_dir("az_blob", NULL);

So you try to create a directory in the root of debugfs called "az_blob"
for every device in the system of this one type?

That will blow up when you have multiple devices of the same type,
please fix.

thanks,

greg k-h