dmaengine: stm32-mdma: Add a check on read_u32_array

Aditya Pakki · vinodkoul · commit 906b40b246b0 · 2019-01-07T09:52:24.000+05:30
In stm32_mdma_probe, after reading the property "st,ahb-addr-masks", the
second call is not checked for failure. This time of check to time of use
case of "count" error is sent upstream.

Signed-off-by: Aditya Pakki &lt;pakki001@umn.edu&gt;
Acked-by: Pierre-Yves MORDRET &lt;pierre-yves.mordret@st.com&gt;
Signed-off-by: Vinod Koul &lt;vkoul@kernel.org&gt;
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
@@ -1579,9 +1579,11 @@ static int stm32_mdma_probe(struct platform_device *pdev)
 
 	dmadev->nr_channels = nr_channels;
 	dmadev->nr_requests = nr_requests;
-	device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
+	ret = device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
 				       dmadev->ahb_addr_masks,
 				       count);
+	if (ret)
+		return ret;
 	dmadev->nr_ahb_addr_masks = count;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
