It is possible that master->cs_gpios is NULL after spi_bitbang_start(), this happens if the master has no CS GPIOs specified in DT. Check for this case after spi_bitbang_start() to prevent NULL pointer dereference in the subsequent for loop, which accesses the master->cs_gpios field. Signed-off-by: Marek Vasut <marex@xxxxxxx> Cc: Martin Kaiser <martin@xxxxxxxxx> Cc: Mark Brown <broonie@xxxxxxxxxx> --- drivers/spi/spi-imx.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 53e7a32..1ef5429 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1268,6 +1268,11 @@ static int spi_imx_probe(struct platform_device *pdev) goto out_clk_put; } + if (!master->cs_gpios) { + dev_err(&pdev->dev, "No CS GPIOs available\n"); + goto out_clk_put; + } + for (i = 0; i < master->num_chipselect; i++) { if (!gpio_is_valid(master->cs_gpios[i])) continue; -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html