[PATCH] spi: ti-qspi: Make sure res_mmap != NULL before dereferencing it

[Boris Brezillon <boris.brezillon@xxxxxxxxxxx>]

resource_size() is dereferencing the res without checking that it is
not NULL, so we need to do the check before calling resource_size().

Fixes: b95cb394ab59 ("spi: ti-qspi: Implement the spi_mem interface")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
---
 drivers/spi/spi-ti-qspi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index c54b760e00ed..5f19016bbf10 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -718,7 +718,9 @@ static int ti_qspi_probe(struct platform_device *pdev)
 				"memory mapped resource not required\n");
 		}
 	}
-	qspi->mmap_size = resource_size(res_mmap);
+
+	if (res_mmap)
+		qspi->mmap_size = resource_size(res_mmap);
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-- 
2.14.1

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