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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: <jgarzik@pobox.com>
Cc: netdev@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: [PATCH 3/11] ibm_newemac: Fix ZMII refcounting bug
Date: Wed, 05 Dec 2007 11:14:27 +1100	[thread overview]
Message-ID: <20071205001536.59F81DDF62@ozlabs.org> (raw)

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@kernel.crashing.org>
Acked-by: Stefan Roese <sr@denx.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);
 

             reply	other threads:[~2007-12-05  0:14 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-05  0:14 Benjamin Herrenschmidt [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-11-30  5:40 [PATCH 0/11] ibm_newemac: Candidate patches for 2.6.25 Benjamin Herrenschmidt
2007-11-30  5:40 ` [PATCH 3/11] ibm_newemac: Fix ZMII refcounting bug Benjamin Herrenschmidt

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