[PATCH v2 0/3] dmaengine : xilinx_dma: Fix error handling paths

[PATCH v2 0/3] dmaengine : xilinx_dma: Fix error handling paths

[Swati Agarwal]

Fix Unchecked return value coverity warning.
Fix probe error cleanup.

v2: split probe cleanup patch into two patches.

Swati Agarwal (3):
  dmaengine: xilinx_dma: Fix devm_platform_ioremap_resource error
    handling
  dmaengine: xilinx_dma: cleanup for fetching xlnx,num-fstores property
  dmaengine: xilinx_dma: Report error in case of
    dma_set_mask_and_coherent API failure

 drivers/dma/xilinx/xilinx_dma.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

-- 
2.17.1


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[PATCH v2 1/3] dmaengine: xilinx_dma: Fix devm_platform_ioremap_resource error handling

[Swati Agarwal]

Add missing cleanup in devm_platform_ioremap_resource().
When probe fails remove dma channel resources and disable clocks in
accordance with the order of resources allocated .

Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index cd62bbb50e8b..ba0dccaa8cf1 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -3160,9 +3160,10 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 
 	/* Request and map I/O memory */
 	xdev->regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(xdev->regs))
-		return PTR_ERR(xdev->regs);
-
+	if (IS_ERR(xdev->regs)) {
+		err = PTR_ERR(xdev->regs);
+		goto disable_clks;
+	}
 	/* Retrieve the DMA engine properties from the device tree */
 	xdev->max_buffer_len = GENMASK(XILINX_DMA_MAX_TRANS_LEN_MAX - 1, 0);
 	xdev->s2mm_chan_id = xdev->dma_config->max_channels / 2;
@@ -3259,7 +3260,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 	for_each_child_of_node(node, child) {
 		err = xilinx_dma_child_probe(xdev, child);
 		if (err < 0)
-			goto disable_clks;
+			goto error;
 	}
 
 	if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
@@ -3294,12 +3295,12 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 
 	return 0;
 
-disable_clks:
-	xdma_disable_allclks(xdev);
 error:
 	for (i = 0; i < xdev->dma_config->max_channels; i++)
 		if (xdev->chan[i])
 			xilinx_dma_chan_remove(xdev->chan[i]);
+disable_clks:
+	xdma_disable_allclks(xdev);
 
 	return err;
 }
-- 
2.17.1


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[PATCH v2 2/3] dmaengine: xilinx_dma: cleanup for fetching xlnx,num-fstores property

[Swati Agarwal]

Free the allocated resources for missing xlnx,num-fstores property.

Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index ba0dccaa8cf1..f63ec9d862ff 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -3191,7 +3191,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 		if (err < 0) {
 			dev_err(xdev->dev,
 				"missing xlnx,num-fstores property\n");
-			return err;
+			goto disable_clks;
 		}
 
 		err = of_property_read_u32(node, "xlnx,flush-fsync",
-- 
2.17.1


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[PATCH v2 3/3] dmaengine: xilinx_dma: Report error in case of dma_set_mask_and_coherent API failure

[Swati Agarwal]

The driver does not handle the failure case while calling
dma_set_mask_and_coherent API.

In case of failure, capture the return value of API and then report an
error.

Addresses-coverity: Unchecked return value (CHECKED_RETURN)

Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index f63ec9d862ff..7ce8bb160a59 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -3211,7 +3211,11 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 		xdev->ext_addr = false;
 
 	/* Set the dma mask bits */
-	dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
+	err = dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
+	if (err < 0) {
+		dev_err(xdev->dev, "DMA mask error %d\n", err);
+		goto disable_clks;
+	}
 
 	/* Initialize the DMA engine */
 	xdev->common.dev = &pdev->dev;
-- 
2.17.1


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Re: [PATCH v2 0/3] dmaengine : xilinx_dma: Fix error handling paths

[Vinod Koul]

On 17-08-22, 11:41, Swati Agarwal wrote:
> Fix Unchecked return value coverity warning.
> Fix probe error cleanup.

Applied, thanks

-- 
~Vinod

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