linux-kernel - [PATCH 1/2] drivers/net/ethernet/nxp/lpc_eth.c: Call mdiobus_unregister before mdiobus

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Date:	Sun, 28 Oct 2012 17:12:00 +0100
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	davem@...emloft.net
Cc:	stigge@...com.de, edumazet@...gle.com, djduanjiong@...il.com,
	aletes.xgr@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH 1/2] drivers/net/ethernet/nxp/lpc_eth.c: Call mdiobus_unregister before mdiobus_free

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>
---
This problem is somewhat mystifying. If the patch is correct, there were
probably many OOPSese caused by not calling mdiobus_unregister...
Reporting anyway...

 drivers/net/ethernet/nxp/lpc_eth.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 53743f7..af8b414 100644
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1524,6 +1524,7 @@ static int lpc_eth_drv_remove(struct platform_device *pdev)
 				  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);
-- 
1.7.11.7

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