spi: mediatek: Avoid NULL pointer crash in interrupt

commit f83a96e5f033fbbd21764705cb9c04234b96218e upstream.

In some case, like after a transfer timeout, master->cur_msg pointer
is NULL which led to a kernel crash when trying to use master->cur_msg->spi.
mtk_spi_can_dma(), pointed by master->can_dma, doesn't use this parameter
avoid the problem by setting NULL as second parameter.

Fixes: a568231f46322 ("spi: mediatek: Add spi bus for Mediatek MT8173")
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Link: https://lore.kernel.org/r/20220131141708.888710-1-benjamin.gaignard@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index a15de10..753bd31 100644 (file)
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -624,7 +624,7 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id)
        else
                mdata->state = MTK_SPI_IDLE;
 
-       if (!master->can_dma(master, master->cur_msg->spi, trans)) {
+       if (!master->can_dma(master, NULL, trans)) {
                if (trans->rx_buf) {
                        cnt = mdata->xfer_len / 4;
                        ioread32_rep(mdata->base + SPI_RX_DATA_REG,