spi: spi-ti-qspi: Fix error handling

'dma_request_chan_by_mask()' can not return NULL.
Try to keep the logic in 'no_dma:' by resetting 'qspi->rx_chan' in case
of error.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index ec6fb09e2e17..0fefa6423ff4 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -714,9 +714,10 @@ static int ti_qspi_probe(struct platform_device *pdev)
         dma_cap_set(DMA_MEMCPY, mask);
 
         qspi->rx_chan = dma_request_chan_by_mask(&mask);
-        if (!qspi->rx_chan) {
+        if (IS_ERR(qspi->rx_chan)) {
                 dev_err(qspi->dev,
                         "No Rx DMA available, trying mmap mode\n");
+                qspi->rx_chan = NULL;
                 ret = 0;
                 goto no_dma;
         }