linux-kernel - [PATCH net-next v4 1/6] net: ravb: Get rid of the temporary variable irq

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Date: Wed, 14 Feb 2024 15:57:55 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: s.shtylyov@....ru,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	biju.das.jz@...renesas.com
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	claudiu.beznea@...on.dev,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v4 1/6] net: ravb: Get rid of the temporary variable irq

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

The 4th argument of ravb_setup_irq() is used to save the IRQ number that
will be further used by the driver code. Not all ravb_setup_irqs() calls
need to save the IRQ number. The previous code used to pass a dummy
variable as the 4th argument in case the IRQ is not needed for further
usage. That is not necessary as the code from ravb_setup_irq() can detect
by itself if the IRQ needs to be saved. Thus, get rid of the code that is
not needed.

Reported-by: Sergey Shtylyov <s.shtylyov@....ru>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
---

Change in v4:
- none

Changes in v3:
- collected tag

Changes in v2:
- use a temporary variable in ravb_setup_irq()

Changes since [2]:
- this patch in new

[2] https://lore.kernel.org/all/20240105082339.1468817-1-claudiu.beznea.uj@bp.renesas.com/

 drivers/net/ethernet/renesas/ravb_main.c | 29 +++++++++++++-----------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index f9a1e9038dbf..a1bf54de0e4c 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2747,24 +2747,27 @@ static int ravb_setup_irq(struct ravb_private *priv, const char *irq_name,
 	struct device *dev = &pdev->dev;
 	const char *dev_name;
 	unsigned long flags;
-	int error;
+	int error, irq_num;
 
 	if (irq_name) {
 		dev_name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", ndev->name, ch);
 		if (!dev_name)
 			return -ENOMEM;
 
-		*irq = platform_get_irq_byname(pdev, irq_name);
+		irq_num = platform_get_irq_byname(pdev, irq_name);
 		flags = 0;
 	} else {
 		dev_name = ndev->name;
-		*irq = platform_get_irq(pdev, 0);
+		irq_num = platform_get_irq(pdev, 0);
 		flags = IRQF_SHARED;
 	}
-	if (*irq < 0)
-		return *irq;
+	if (irq_num < 0)
+		return irq_num;
+
+	if (irq)
+		*irq = irq_num;
 
-	error = devm_request_irq(dev, *irq, handler, flags, dev_name, ndev);
+	error = devm_request_irq(dev, irq_num, handler, flags, dev_name, ndev);
 	if (error)
 		netdev_err(ndev, "cannot request IRQ %s\n", dev_name);
 
@@ -2776,7 +2779,7 @@ static int ravb_setup_irqs(struct ravb_private *priv)
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device *ndev = priv->ndev;
 	const char *irq_name, *emac_irq_name;
-	int error, irq;
+	int error;
 
 	if (!info->multi_irqs)
 		return ravb_setup_irq(priv, NULL, NULL, &ndev->irq, ravb_interrupt);
@@ -2799,28 +2802,28 @@ static int ravb_setup_irqs(struct ravb_private *priv)
 		return error;
 
 	if (info->err_mgmt_irqs) {
-		error = ravb_setup_irq(priv, "err_a", "err_a", &irq, ravb_multi_interrupt);
+		error = ravb_setup_irq(priv, "err_a", "err_a", NULL, ravb_multi_interrupt);
 		if (error)
 			return error;
 
-		error = ravb_setup_irq(priv, "mgmt_a", "mgmt_a", &irq, ravb_multi_interrupt);
+		error = ravb_setup_irq(priv, "mgmt_a", "mgmt_a", NULL, ravb_multi_interrupt);
 		if (error)
 			return error;
 	}
 
-	error = ravb_setup_irq(priv, "ch0", "ch0:rx_be", &irq, ravb_be_interrupt);
+	error = ravb_setup_irq(priv, "ch0", "ch0:rx_be", NULL, ravb_be_interrupt);
 	if (error)
 		return error;
 
-	error = ravb_setup_irq(priv, "ch1", "ch1:rx_nc", &irq, ravb_nc_interrupt);
+	error = ravb_setup_irq(priv, "ch1", "ch1:rx_nc", NULL, ravb_nc_interrupt);
 	if (error)
 		return error;
 
-	error = ravb_setup_irq(priv, "ch18", "ch18:tx_be", &irq, ravb_be_interrupt);
+	error = ravb_setup_irq(priv, "ch18", "ch18:tx_be", NULL, ravb_be_interrupt);
 	if (error)
 		return error;
 
-	return ravb_setup_irq(priv, "ch19", "ch19:tx_nc", &irq, ravb_nc_interrupt);
+	return ravb_setup_irq(priv, "ch19", "ch19:tx_nc", NULL, ravb_nc_interrupt);
 }
 
 static int ravb_probe(struct platform_device *pdev)
-- 
2.39.2