--- zzzz-none-000/linux-4.4.271/drivers/spi/spi-bitbang.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/spi/spi-bitbang.c	2023-04-19 10:22:29.000000000 +0000
@@ -231,13 +231,14 @@
 }
 EXPORT_SYMBOL_GPL(spi_bitbang_cleanup);
 
-static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
+int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct spi_bitbang_cs	*cs = spi->controller_state;
 	unsigned		nsecs = cs->nsecs;
 
 	return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t);
 }
+EXPORT_SYMBOL_GPL(spi_bitbang_bufs);
 
 /*----------------------------------------------------------------------*/