linux-kernel - [PATCH 3/4] uio: uio_fsl_elbc_gpcm: use device-managed allocators

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Date:   Thu, 19 Nov 2020 17:49:02 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 3/4] uio: uio_fsl_elbc_gpcm: use device-managed allocators

This change moves all the simple allocations to use device-managed
allocator functions. This way their life-time is tied to the
platform_device object, so when this gets free'd these allocations also get
cleaned up.
The final effect is that error & exit paths get cleaned up a bit.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/uio/uio_fsl_elbc_gpcm.c | 32 +++++++++-----------------------
 1 file changed, 9 insertions(+), 23 deletions(-)

diff --git a/drivers/uio/uio_fsl_elbc_gpcm.c b/drivers/uio/uio_fsl_elbc_gpcm.c
index be8a6905f507..7d8eb9dc2068 100644
--- a/drivers/uio/uio_fsl_elbc_gpcm.c
+++ b/drivers/uio/uio_fsl_elbc_gpcm.c
@@ -299,7 +299,7 @@ static int get_of_data(struct fsl_elbc_gpcm *priv, struct device_node *node,
 	/* get optional uio name */
 	if (of_property_read_string(node, "uio_name", &dt_name) != 0)
 		dt_name = "eLBC_GPCM";
-	*name = kstrdup(dt_name, GFP_KERNEL);
+	*name = devm_kstrdup(priv->dev, dt_name, GFP_KERNEL);
 	if (!*name)
 		return -ENOMEM;
 
@@ -324,7 +324,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	/* allocate private data */
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 	priv->dev = &pdev->dev;
@@ -334,14 +334,12 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 	ret = get_of_data(priv, node, &res, &reg_br_new, &reg_or_new,
 			  &irq, &uio_name);
 	if (ret)
-		goto out_err0;
+		return ret;
 
 	/* allocate UIO structure */
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (!info) {
-		ret = -ENOMEM;
-		goto out_err0;
-	}
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
 
 	/* get current BR/OR values */
 	reg_br_cur = in_be32(&priv->lbc->bank[priv->bank].br);
@@ -354,8 +352,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 		     != fsl_lbc_addr(res.start)) {
 			dev_err(priv->dev,
 				"bank in use by another peripheral\n");
-			ret = -ENODEV;
-			goto out_err1;
+			return -ENODEV;
 		}
 
 		/* warn if behavior settings changing */
@@ -382,12 +379,11 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 	info->mem[0].internal_addr = ioremap(res.start, resource_size(&res));
 	if (!info->mem[0].internal_addr) {
 		dev_err(priv->dev, "failed to map chip region\n");
-		ret = -ENODEV;
-		goto out_err1;
+		return -ENODEV;
 	}
 
 	/* set all UIO data */
-	info->mem[0].name = kasprintf(GFP_KERNEL, "%pOFn", node);
+	info->mem[0].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", node);
 	info->mem[0].addr = res.start;
 	info->mem[0].size = resource_size(&res);
 	info->mem[0].memtype = UIO_MEM_PHYS;
@@ -428,12 +424,6 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 	if (priv->shutdown)
 		priv->shutdown(info, true);
 	iounmap(info->mem[0].internal_addr);
-out_err1:
-	kfree(info->mem[0].name);
-	kfree(info);
-out_err0:
-	kfree(uio_name);
-	kfree(priv);
 	return ret;
 }
 
@@ -447,10 +437,6 @@ static int uio_fsl_elbc_gpcm_remove(struct platform_device *pdev)
 	if (priv->shutdown)
 		priv->shutdown(info, false);
 	iounmap(info->mem[0].internal_addr);
-	kfree(info->mem[0].name);
-	kfree(info->name);
-	kfree(info);
-	kfree(priv);
 
 	return 0;
 
-- 
2.17.1