efi_loader: function to unlink udevice and handle
When deleting a device or a handle we must remove the link between the two
to avoid dangling references.
Provide function efi_unlink_dev() for this purpose.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 8c45e3e..6f78f77 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -708,6 +708,7 @@
int algo_to_len(const char *algo);
int efi_link_dev(efi_handle_t handle, struct udevice *dev);
+int efi_unlink_dev(efi_handle_t handle);
/**
* efi_size_in_pages() - convert size in bytes to size in pages
diff --git a/lib/efi_loader/efi_helper.c b/lib/efi_loader/efi_helper.c
index 8ed564e..c71e87d 100644
--- a/lib/efi_loader/efi_helper.c
+++ b/lib/efi_loader/efi_helper.c
@@ -171,3 +171,22 @@
handle->dev = dev;
return dev_tag_set_ptr(dev, DM_TAG_EFI, handle);
}
+
+/**
+ * efi_unlink_dev() - unlink udevice and handle
+ *
+ * @handle: EFI handle to unlink
+ *
+ * Return: 0 on success, negative on failure
+ */
+int efi_unlink_dev(efi_handle_t handle)
+{
+ int ret;
+
+ ret = dev_tag_del(handle->dev, DM_TAG_EFI);
+ if (ret)
+ return ret;
+ handle->dev = NULL;
+
+ return 0;
+}