netdev - [PATCH] net: dsa: bcm_sf2: Unwind errors in correct order

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Message-Id: <1469820957-21496-1-git-send-email-f.fainelli@gmail.com>
Date:	Fri, 29 Jul 2016 12:35:57 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, andrew@...n.ch,
	vivien.didelot@...oirfairelinux.com,
	Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH] net: dsa: bcm_sf2: Unwind errors in correct order

In case we cannot complete bcm_sf2_sw_setup() for any reason, and we
go to the out_unmap label, but the MDIO bus has not been registered yet,
we will hit the BUG condition in drivers/net/phy/mdio_bus.c about the
bus not being registered. Fix this by dedicating a specific lable for
when we fail after the MDIO bus has been successfully registered.

Fixes: 461cd1b03e32 ("net: dsa: bcm_sf2: Register our slave MDIO bus")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/bcm_sf2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index cd1d630ae3a9..b2b838724a9b 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -1622,7 +1622,7 @@ static int bcm_sf2_sw_setup(struct dsa_switch *ds)
 			  "switch_0", priv);
 	if (ret < 0) {
 		pr_err("failed to request switch_0 IRQ\n");
-		goto out_unmap;
+		goto out_mdio;
 	}
 
 	ret = request_irq(priv->irq1, bcm_sf2_switch_1_isr, 0,
@@ -1679,6 +1679,8 @@ static int bcm_sf2_sw_setup(struct dsa_switch *ds)
 
 out_free_irq0:
 	free_irq(priv->irq0, priv);
+out_mdio:
+	bcm_sf2_mdio_unregister(priv);
 out_unmap:
 	base = &priv->core;
 	for (i = 0; i < BCM_SF2_REGS_NUM; i++) {
@@ -1686,7 +1688,6 @@ out_unmap:
 			iounmap(*base);
 		base++;
 	}
-	bcm_sf2_mdio_unregister(priv);
 	return ret;
 }
 
-- 
2.7.4