1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/spi/omap_uwire.c b/drivers/spi/omap_uwire.c
index 95183e1df525..d275c615a73e 100644
--- a/drivers/spi/omap_uwire.c
+++ b/drivers/spi/omap_uwire.c
@@ -445,10 +445,19 @@ done:
         return status;
 }
 
+/* the spi->mode bits understood by this driver: */
+#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
+
 static int uwire_setup(struct spi_device *spi)
 {
         struct uwire_state *ust = spi->controller_state;
 
+        if (spi->mode & ~MODEBITS) {
+                dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
+                        spi->mode & ~MODEBITS);
+                return -EINVAL;
+        }
+
         if (ust == NULL) {
                 ust = kzalloc(sizeof(*ust), GFP_KERNEL);
                 if (ust == NULL)