diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index cce80e6..075bede 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -1115,12 +1115,7 @@
 extern struct spi_device *
 spi_new_device(struct spi_master *, struct spi_board_info *);
 
-static inline void
-spi_unregister_device(struct spi_device *spi)
-{
-	if (spi)
-		device_unregister(&spi->dev);
-}
+extern void spi_unregister_device(struct spi_device *spi);
 
 extern const struct spi_device_id *
 spi_get_device_id(const struct spi_device *sdev);