uio: uio_dmem_genirq: Catch the Exception

The return value of dma_set_coherent_mask() is not always 0.
To catch the exception in case that dma is not support the mask.

Fixes: 0a0c3b5 ("Add new uio device for dynamic memory allocation")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20211204000326.1592687-1-jiasheng@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/uio/uio_dmem_genirq.c

@@ -188,7 +188,11 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(&pdev->dev, "DMA enable failed\n");
+		return ret;
+	}
 
 	priv->uioinfo = uioinfo;
 	spin_lock_init(&priv->lock);