Patch "eth: bcmsysport: fix call balance of priv->clk handling routines" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    eth: bcmsysport: fix call balance of priv->clk handling routines

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     eth-bcmsysport-fix-call-balance-of-priv-clk-handling.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 851a0bd790818341e11bb33f5a07b8f4ff6e9d1d
Author: Vitalii Mordan <mordan@xxxxxxxxx>
Date:   Fri Dec 27 15:30:07 2024 +0300

    eth: bcmsysport: fix call balance of priv->clk handling routines
    
    [ Upstream commit b255ef45fcc2141c1bf98456796abb956d843a27 ]
    
    Check the return value of clk_prepare_enable to ensure that priv->clk has
    been successfully enabled.
    
    If priv->clk was not enabled during bcm_sysport_probe, bcm_sysport_resume,
    or bcm_sysport_open, it must not be disabled in any subsequent execution
    paths.
    
    Fixes: 31bc72d97656 ("net: systemport: fetch and use clock resources")
    Signed-off-by: Vitalii Mordan <mordan@xxxxxxxxx>
    Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
    Link: https://patch.msgid.link/20241227123007.2333397-1-mordan@xxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 49e890a7e04a..23cc2d85994e 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1967,7 +1967,11 @@ static int bcm_sysport_open(struct net_device *dev)
 	unsigned int i;
 	int ret;
 
-	clk_prepare_enable(priv->clk);
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		netdev_err(dev, "could not enable priv clock\n");
+		return ret;
+	}
 
 	/* Reset UniMAC */
 	umac_reset(priv);
@@ -2625,7 +2629,11 @@ static int bcm_sysport_probe(struct platform_device *pdev)
 		goto err_deregister_notifier;
 	}
 
-	clk_prepare_enable(priv->clk);
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "could not enable priv clock\n");
+		goto err_deregister_netdev;
+	}
 
 	priv->rev = topctrl_readl(priv, REV_CNTL) & REV_MASK;
 	dev_info(&pdev->dev,
@@ -2639,6 +2647,8 @@ static int bcm_sysport_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_deregister_netdev:
+	unregister_netdev(dev);
 err_deregister_notifier:
 	unregister_netdevice_notifier(&priv->netdev_notifier);
 err_deregister_fixed_link:
@@ -2810,7 +2820,12 @@ static int __maybe_unused bcm_sysport_resume(struct device *d)
 	if (!netif_running(dev))
 		return 0;
 
-	clk_prepare_enable(priv->clk);
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		netdev_err(dev, "could not enable priv clock\n");
+		return ret;
+	}
+
 	if (priv->wolopts)
 		clk_disable_unprepare(priv->wol_clk);