[PATCHv2 net-next] net: dsa: b53: srab: propagate errors from init helpers

[Rosen Penev <rosenp@gmail.com>]

Convert b53_srab_prepare_irq() and b53_srab_mux_init() from void to
int-returning functions so probe failures are properly propagated.

b53_srab_prepare_irq() now returns -ENOMEM on allocation failure and
-EPROBE_DEFER if any port IRQ is not yet available.

b53_srab_mux_init() now returns PTR_ERR on ioremap failure instead of
silently ignoring it.

Check and propagate both return values in b53_srab_probe() so the
driver core sees the real error instead of always reaching
b53_switch_register().

Add error handling in probe as a result of b53_srab_prepare_irq().

Assisted-by: Opencode:Big-Pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 v2: address memory leak in b53_srab_prepare_irq().
 drivers/net/dsa/b53/b53_srab.c | 36 ++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index b9939bbd2cd5..289504321f3e 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -531,7 +531,7 @@ static void b53_srab_intr_set(struct b53_srab_priv *priv, bool set)
 	writel(reg, priv->regs + B53_SRAB_CTRLS);
 }
 
-static void b53_srab_prepare_irq(struct platform_device *pdev)
+static int b53_srab_prepare_irq(struct platform_device *pdev)
 {
 	struct b53_device *dev = platform_get_drvdata(pdev);
 	struct b53_srab_priv *priv = dev->priv;
@@ -551,18 +551,22 @@ static void b53_srab_prepare_irq(struct platform_device *pdev)
 
 		name = kasprintf(GFP_KERNEL, "link_state_p%d", i);
 		if (!name)
-			return;
+			return -ENOMEM;
 
 		port->num = i;
 		port->dev = dev;
 		port->irq = platform_get_irq_byname_optional(pdev, name);
 		kfree(name);
+		if (port->irq == -EPROBE_DEFER)
+			return port->irq;
 	}
 
 	b53_srab_intr_set(priv, true);
+
+	return 0;
 }
 
-static void b53_srab_mux_init(struct platform_device *pdev)
+static int b53_srab_mux_init(struct platform_device *pdev)
 {
 	struct b53_device *dev = platform_get_drvdata(pdev);
 	struct b53_srab_priv *priv = dev->priv;
@@ -572,11 +576,11 @@ static void b53_srab_mux_init(struct platform_device *pdev)
 	int ret;
 
 	if (dev->pdata && dev->pdata->chip_id != BCM58XX_DEVICE_ID)
-		return;
+		return -ENODEV;
 
 	priv->mux_config = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(priv->mux_config))
-		return;
+		return PTR_ERR(priv->mux_config);
 
 	/* Obtain the port mux configuration so we know which lanes
 	 * actually map to SerDes lanes
@@ -613,6 +617,8 @@ static void b53_srab_mux_init(struct platform_device *pdev)
 			dev_info(&pdev->dev, "Port %d mode: %s\n",
 				 port, phy_modes(p->mode));
 	}
+
+	return 0;
 }
 
 static int b53_srab_probe(struct platform_device *pdev)
@@ -622,6 +628,7 @@ static int b53_srab_probe(struct platform_device *pdev)
 	const struct of_device_id *of_id = NULL;
 	struct b53_srab_priv *priv;
 	struct b53_device *dev;
+	int err;
 
 	if (dn)
 		of_id = of_match_node(b53_srab_of_match, dn);
@@ -651,10 +658,23 @@ static int b53_srab_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, dev);
 
-	b53_srab_prepare_irq(pdev);
-	b53_srab_mux_init(pdev);
+	err = b53_srab_prepare_irq(pdev);
+	if (err)
+		return err;
+
+	err = b53_srab_mux_init(pdev);
+	if (err)
+		goto err_irq;
+
+	err = b53_switch_register(dev);
+	if (err)
+		goto err_irq;
+
+	return 0;
 
-	return b53_switch_register(dev);
+err_irq:
+	b53_srab_intr_set(priv, false);
+	return err;
 }
 
 static void b53_srab_remove(struct platform_device *pdev)
-- 
2.55.0