netdev - [PATCH 3/11] ibm_newemac: Fix ZMII refcounting bug

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Message-Id: <20071205001536.59F81DDF62@ozlabs.org>
Date:	Wed, 05 Dec 2007 11:14:27 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	<jgarzik@...ox.com>
CC:	<netdev@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
Subject: [PATCH 3/11] ibm_newemac: Fix ZMII refcounting bug

When using ZMII for MDIO only (such as 440GX with RGMII for data and ZMII for
MDIO), the ZMII code would fail to properly refcount, thus triggering a
BUG_ON().

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Acked-by: Stefan Roese <sr@...x.de>
---

 drivers/net/ibm_newemac/zmii.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-work/drivers/net/ibm_newemac/zmii.c
===================================================================
--- linux-work.orig/drivers/net/ibm_newemac/zmii.c	2007-11-08 15:45:32.000000000 +1100
+++ linux-work/drivers/net/ibm_newemac/zmii.c	2007-11-08 15:46:21.000000000 +1100
@@ -83,12 +83,14 @@ int __devinit zmii_attach(struct of_devi
 
 	ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
 
-	if (!zmii_valid_mode(*mode))
+	if (!zmii_valid_mode(*mode)) {
 		/* Probably an EMAC connected to RGMII,
 		 * but it still may need ZMII for MDIO so
 		 * we don't fail here.
 		 */
+		dev->users++;
 		return 0;
+	}
 
 	mutex_lock(&dev->lock);
 
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