linux-kernel - [ 43/57] drivers/net/ethernet/nxp/lpc_eth.c: Call mdiobus_unregister before mdiobus

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Date:	Wed, 14 Nov 2012 20:11:51 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Peter Senna Tschudin <peter.senna@...il.com>,
	Roland Stigge <stigge@...com.de>,
	Alexandre Pereira da Silva <aletes.xgr@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 43/57] drivers/net/ethernet/nxp/lpc_eth.c: Call mdiobus_unregister before mdiobus_free

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Peter Senna Tschudin <peter.senna@...il.com>

[ Upstream commit 57c10b61c84bfed68b1b317d6f507a392724b9c4 ]

Based on commit b27393aecf66199f5ddad37c302d3e0cfadbe6c0

Calling mdiobus_free without calling mdiobus_unregister causes
BUG_ON(). This patch fixes the issue.

The semantic patch that found this issue(http://coccinelle.lip6.fr/):
// <smpl>
@@
expression E;
@@
  ... when != mdiobus_unregister(E);

+ mdiobus_unregister(E);
  mdiobus_free(E);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
Tested-by: Roland Stigge <stigge@...com.de>
Tested-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/nxp/lpc_eth.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1523,6 +1523,7 @@ static int lpc_eth_drv_remove(struct pla
 				  pldat->dma_buff_base_p);
 	free_irq(ndev->irq, ndev);
 	iounmap(pldat->net_base);
+	mdiobus_unregister(pldat->mii_bus);
 	mdiobus_free(pldat->mii_bus);
 	clk_disable(pldat->clk);
 	clk_put(pldat->clk);


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