linux-kernel - [PATCH net-next 1/4] net: ibm: emac: tah: use devm and dev

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Message-ID: <20240907222147.21723-2-rosenp@gmail.com>
Date: Sat,  7 Sep 2024 15:21:44 -0700
From: Rosen Penev <rosenp@...il.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-kernel@...r.kernel.org,
	jacob.e.keller@...el.com,
	horms@...nel.org,
	sd@...asysnail.net,
	chunkeey@...il.com
Subject: [PATCH net-next 1/4] net: ibm: emac: tah: use devm and dev_err

Simplifies the driver by removing manual frees and using dev_err instead
of printk. pdev->dev has the of_node name in it. eg.

TAH /plb/opb/emac-tah@...01350 initialized

vs

emac-tah 4ef601350.emac-tah: initialized

close enough.

Signed-off-by: Rosen Penev <rosenp@...il.com>
---
 drivers/net/ethernet/ibm/emac/tah.c | 60 ++++++++++-------------------
 1 file changed, 21 insertions(+), 39 deletions(-)

diff --git a/drivers/net/ethernet/ibm/emac/tah.c b/drivers/net/ethernet/ibm/emac/tah.c
index fa3488258ca2..84e2091c193a 100644
--- a/drivers/net/ethernet/ibm/emac/tah.c
+++ b/drivers/net/ethernet/ibm/emac/tah.c
@@ -43,9 +43,9 @@ void tah_detach(struct platform_device *ofdev, int channel)
 	mutex_unlock(&dev->lock);
 }
 
-void tah_reset(struct platform_device *ofdev)
+void tah_reset(struct platform_device *pdev)
 {
-	struct tah_instance *dev = platform_get_drvdata(ofdev);
+	struct tah_instance *dev = platform_get_drvdata(pdev);
 	struct tah_regs __iomem *p = dev->base;
 	int n;
 
@@ -56,7 +56,7 @@ void tah_reset(struct platform_device *ofdev)
 		--n;
 
 	if (unlikely(!n))
-		printk(KERN_ERR "%pOF: reset timeout\n", ofdev->dev.of_node);
+		dev_err(&pdev->dev, "reset timeout");
 
 	/* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
 	out_be32(&p->mr,
@@ -85,61 +85,44 @@ void *tah_dump_regs(struct platform_device *ofdev, void *buf)
 	return regs + 1;
 }
 
-static int tah_probe(struct platform_device *ofdev)
+static int tah_probe(struct platform_device *pdev)
 {
-	struct device_node *np = ofdev->dev.of_node;
+	struct device_node *np = pdev->dev.of_node;
 	struct tah_instance *dev;
 	struct resource regs;
 	int rc;
 
-	rc = -ENOMEM;
-	dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
-	if (dev == NULL)
-		goto err_gone;
+	dev = devm_kzalloc(&pdev->dev, sizeof(struct tah_instance), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
 
 	mutex_init(&dev->lock);
-	dev->ofdev = ofdev;
+	dev->ofdev = pdev;
 
-	rc = -ENXIO;
-	if (of_address_to_resource(np, 0, &regs)) {
-		printk(KERN_ERR "%pOF: Can't get registers address\n", np);
-		goto err_free;
+	rc = of_address_to_resource(np, 0, &regs);
+	if (rc) {
+		dev_err(&pdev->dev, "can't get registers address");
+		return rc;
 	}
 
-	rc = -ENOMEM;
-	dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
-					       sizeof(struct tah_regs));
-	if (dev->base == NULL) {
-		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
-		goto err_free;
+	dev->base =
+		devm_ioremap(&pdev->dev, regs.start, sizeof(struct tah_regs));
+	if (!dev->base) {
+		dev_err(&pdev->dev, "can't map device registers");
+		return -ENOMEM;
 	}
 
-	platform_set_drvdata(ofdev, dev);
+	platform_set_drvdata(pdev, dev);
 
 	/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
-	tah_reset(ofdev);
+	tah_reset(pdev);
 
-	printk(KERN_INFO "TAH %pOF initialized\n", ofdev->dev.of_node);
+	dev_info(&pdev->dev, "initialized");
 	wmb();
 
-	return 0;
-
- err_free:
-	kfree(dev);
- err_gone:
 	return rc;
 }
 
-static void tah_remove(struct platform_device *ofdev)
-{
-	struct tah_instance *dev = platform_get_drvdata(ofdev);
-
-	WARN_ON(dev->users != 0);
-
-	iounmap(dev->base);
-	kfree(dev);
-}
-
 static const struct of_device_id tah_match[] =
 {
 	{
@@ -158,7 +141,6 @@ static struct platform_driver tah_driver = {
 		.of_match_table = tah_match,
 	},
 	.probe = tah_probe,
-	.remove_new = tah_remove,
 };
 
 int __init tah_init(void)
-- 
2.46.0