spi/bfin_spi: reject unsupported SPI modes

Who knows what people will try!

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 18b313a57236..a91e556489a9 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -1022,6 +1022,10 @@ static int bfin_spi_setup(struct spi_device *spi)
         }
 
         /* translate common spi framework into our register */
+        if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) {
+                dev_err(&spi->dev, "unsupported spi modes detected\n");
+                goto error;
+        }
         if (spi->mode & SPI_CPOL)
                 chip->ctl_reg |= BIT_CTL_CPOL;
         if (spi->mode & SPI_CPHA)