spi: More sanity checks for transfers

Check that transfers are non-empty and that there is a completion for
them.

Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a52f16685d6a..c2899161ccac 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1351,6 +1351,11 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
         struct spi_master *master = spi->master;
         struct spi_transfer *xfer;
 
+        if (list_empty(&message->transfers))
+                return -EINVAL;
+        if (!message->complete)
+                return -EINVAL;
+
         /* Half-duplex links include original MicroWire, and ones with
          * only one data pin like SPI_3WIRE (switches direction) or where
          * either MOSI or MISO is missing.  They can also be caused by