dw_dmac: apply default dma_mask if needed

In some cases we got the device without dma_mask configured. We have to apply
the default value to avoid crashes during memory mapping.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 6694676c9b82..4c83f18803f1 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1661,6 +1661,12 @@ static int dw_probe(struct platform_device *pdev)
         if (!regs)
                 return -EBUSY;
 
+        /* Apply default dma_mask if needed */
+        if (!pdev->dev.dma_mask) {
+                pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+                pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+        }
+
         dw_params = dma_read_byaddr(regs, DW_PARAMS);
         autocfg = dw_params >> DW_PARAMS_EN & 0x1;