spi: More sanity checks for transfers

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 978dda2..c289916 100644 (file)
--- 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
@@ -1387,6 +1392,13 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
                                        BIT(xfer->bits_per_word - 1)))
                                return -EINVAL;
                }
+
+               if (xfer->speed_hz && master->min_speed_hz &&
+                   xfer->speed_hz < master->min_speed_hz)
+                       return -EINVAL;
+               if (xfer->speed_hz && master->max_speed_hz &&
+                   xfer->speed_hz > master->max_speed_hz)
+                       return -EINVAL;
        }
 
        message->spi = spi;