spi: Limit the spi device max speed to controller's max speed

Make sure the max_speed_hz of spi_device does not override
the max_speed_hz of controller.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20201209173514.93328-1-tudor.ambarus@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index fc9a59788d2eab8a46761115c0a067001a3f7d28..45021d271da2ce423d1569700547648db71c161f 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3369,7 +3369,8 @@ int spi_setup(struct spi_device *spi)
        if (status)
                return status;
 
-       if (!spi->max_speed_hz)
+       if (!spi->max_speed_hz ||
+           spi->max_speed_hz > spi->controller->max_speed_hz)
                spi->max_speed_hz = spi->controller->max_speed_hz;
 
        mutex_lock(&spi->controller->io_mutex);