Re: [PATCH v4 1/5] net: ethernet: cpsw: switch to devres allocations

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On 08/23/2013 06:16 PM, Daniel Mack wrote:

This patch cleans up the allocation and error unwind paths, which
allows us to carry less information in struct cpsw_priv and reduce the
amount of jump labels in the probe functions.

Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
---
  drivers/net/ethernet/ti/cpsw.c | 147 +++++++++++++----------------------------
  1 file changed, 45 insertions(+), 102 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 79974e3..849af52 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
[...]
@@ -1977,55 +1963,41 @@ static int cpsw_probe(struct platform_device *pdev)
  	priv->slaves[0].ndev = ndev;
  	priv->emac_port = 0;

-	priv->clk = clk_get(&pdev->dev, "fck");
+	priv->clk = devm_clk_get(&pdev->dev, "fck");
  	if (IS_ERR(priv->clk)) {
-		dev_err(&pdev->dev, "fck is not found\n");
+		dev_err(priv->dev, "fck is not found\n");
  		ret = -ENODEV;
-		goto clean_slave_ret;
+		goto clean_runtime_disable_ret;
  	}
  	priv->coal_intvl = 0;
  	priv->bus_freq_mhz = clk_get_rate(priv->clk) / 1000000;

-	priv->cpsw_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!priv->cpsw_res) {
+	ss_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!ss_res) {

   You don't need to check the result of platform_get_resource() if you call
devm_ioremap_resource() right afterwards -- it will check resource ptr for NULL the first thing. :-)

  		dev_err(priv->dev, "error getting i/o resource\n");
  		ret = -ENOENT;
-		goto clean_clk_ret;
+		goto clean_runtime_disable_ret;
  	}
-	if (!request_mem_region(priv->cpsw_res->start,
-				resource_size(priv->cpsw_res), ndev->name)) {
-		dev_err(priv->dev, "failed request i/o region\n");
-		ret = -ENXIO;
-		goto clean_clk_ret;
-	}
-	ss_regs = ioremap(priv->cpsw_res->start, resource_size(priv->cpsw_res));
-	if (!ss_regs) {
+	ss_regs = devm_ioremap_resource(&pdev->dev, ss_res);
+	if (IS_ERR(ss_regs)) {
  		dev_err(priv->dev, "unable to map i/o region\n");

Don't need the error message anymore -- devm_ioremap_resource() will print it. And you missed:

		ret = PTR_ERR(ss_regs);

-		goto clean_cpsw_iores_ret;
+		goto clean_runtime_disable_ret;
  	}
  	priv->regs = ss_regs;
  	priv->version = __raw_readl(&priv->regs->id_ver);
  	priv->host_port = HOST_PORT_NUM;

-	priv->cpsw_wr_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!priv->cpsw_wr_res) {
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {

   Same comment about resource check here...

  		dev_err(priv->dev, "error getting i/o resource\n");
  		ret = -ENOENT;
-		goto clean_iomap_ret;
-	}
-	if (!request_mem_region(priv->cpsw_wr_res->start,
-			resource_size(priv->cpsw_wr_res), ndev->name)) {
-		dev_err(priv->dev, "failed request i/o region\n");
-		ret = -ENXIO;
-		goto clean_iomap_ret;
+		goto clean_runtime_disable_ret;
  	}
-	wr_regs = ioremap(priv->cpsw_wr_res->start,
-				resource_size(priv->cpsw_wr_res));
-	if (!wr_regs) {
+	priv->wr_regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(priv->wr_regs)) {
  		dev_err(priv->dev, "unable to map i/o region\n");

And same comments about the unneeded error message and missing 'ret' assignment here...

-		goto clean_cpsw_wr_iores_ret;
+		goto clean_runtime_disable_ret;
  	}
-	priv->wr_regs = wr_regs;

  	memset(&dma_params, 0, sizeof(dma_params));
  	memset(&ale_params, 0, sizeof(ale_params));
[...]

WBR, Sergei

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