[PATCH net] net: gemini: Fix another missing clk_disable_unprepare() in probe

[PATCH net] net: gemini: Fix another missing clk_disable_unprepare() in probe

[Dan Carpenter]

We recently added some calls to clk_disable_unprepare() but we missed
the last error path if register_netdev() fails.

I made a couple cleanups so we avoid mistakes like this in the future.
First I reversed the "if (!ret)" condition and pulled the code in one
indent level.  Also, the "port->netdev = NULL;" is not required because
"port" isn't used again outside this function so I deleted that line.

Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethernet")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/net/ethernet/cortina/gemini.c | 34 +++++++++++++--------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
index 62e271aea4a5..ffec0f3dd957 100644
--- a/drivers/net/ethernet/cortina/gemini.c
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -2446,8 +2446,8 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 	port->reset = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(port->reset)) {
 		dev_err(dev, "no reset\n");
-		clk_disable_unprepare(port->pclk);
-		return PTR_ERR(port->reset);
+		ret = PTR_ERR(port->reset);
+		goto unprepare;
 	}
 	reset_control_reset(port->reset);
 	usleep_range(100, 500);
@@ -2502,25 +2502,25 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 					IRQF_SHARED,
 					port_names[port->id],
 					port);
-	if (ret) {
-		clk_disable_unprepare(port->pclk);
-		return ret;
-	}
+	if (ret)
+		goto unprepare;
 
 	ret = register_netdev(netdev);
-	if (!ret) {
+	if (ret)
+		goto unprepare;
+
+	netdev_info(netdev,
+		    "irq %d, DMA @ 0x%pap, GMAC @ 0x%pap\n",
+		    port->irq, &dmares->start,
+		    &gmacres->start);
+	ret = gmac_setup_phy(netdev);
+	if (ret)
 		netdev_info(netdev,
-			    "irq %d, DMA @ 0x%pap, GMAC @ 0x%pap\n",
-			    port->irq, &dmares->start,
-			    &gmacres->start);
-		ret = gmac_setup_phy(netdev);
-		if (ret)
-			netdev_info(netdev,
-				    "PHY init failed, deferring to ifup time\n");
-		return 0;
-	}
+			    "PHY init failed, deferring to ifup time\n");
+	return 0;
 
-	port->netdev = NULL;
+unprepare:
+	clk_disable_unprepare(port->pclk);
 	return ret;
 }
 
-- 
2.28.0

Re: [PATCH net] net: gemini: Fix another missing clk_disable_unprepare() in probe

[David Miller]

From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 2 Sep 2020 14:56:31 +0300

> We recently added some calls to clk_disable_unprepare() but we missed
> the last error path if register_netdev() fails.
> 
> I made a couple cleanups so we avoid mistakes like this in the future.
> First I reversed the "if (!ret)" condition and pulled the code in one
> indent level.  Also, the "port->netdev = NULL;" is not required because
> "port" isn't used again outside this function so I deleted that line.
> 
> Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethernet")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Applied and queued up for -stable, thanks.

Unrelated to your patch but...

>  	ret = register_netdev(netdev);
 ...
> +	ret = gmac_setup_phy(netdev);

Should we really be setting up the PHY after registering the netdev?

The moment we register it, entities can try to bring the interface up
and shouldn't we have the PHY bits all squared away before that?