spi: dw: fix kernel crash due to NULL pointer dereference

commit 08a707b87874eaaa0f336ab604ecd6e5e9f286dd upstream.

The obvious fix after the commit d9c73bb8a3a5 "spi: dw: add support for gpio
controlled chip select". This patch fixes the issue by using locally defined
temporary variable.

Fixes: d9c73bb8a3a5 (spi: dw: add support for gpio controlled chip select)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 29f33143b795651e773ea7b9d5cc0f80c7cb2575..670f0627f3bfc793092495be55f3d6fd9854dd34 100644 (file)
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -271,7 +271,7 @@ static void giveback(struct dw_spi *dws)
                                        transfer_list);
 
        if (!last_transfer->cs_change)
-               spi_chip_sel(dws, dws->cur_msg->spi, 0);
+               spi_chip_sel(dws, msg->spi, 0);
 
        spi_finalize_current_message(dws->master);
 }