linux-kernel - [PATCH 2/2] drivers/net/phy/mdio-bitbang.c: Call mdiobus_unregister before mdiobus

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Date:	Sun, 28 Oct 2012 17:12:01 +0100
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	davem@...emloft.net
Cc:	srinivas.kandagatla@...com, peter.senna@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2] drivers/net/phy/mdio-bitbang.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/phy/mdio-bitbang.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/mdio-bitbang.c b/drivers/net/phy/mdio-bitbang.c
index daec9b0..6428fcb 100644
--- a/drivers/net/phy/mdio-bitbang.c
+++ b/drivers/net/phy/mdio-bitbang.c
@@ -234,6 +234,7 @@ void free_mdio_bitbang(struct mii_bus *bus)
 	struct mdiobb_ctrl *ctrl = bus->priv;
 
 	module_put(ctrl->ops->owner);
+	mdiobus_unregister(bus);
 	mdiobus_free(bus);
 }
 EXPORT_SYMBOL(free_mdio_bitbang);
-- 
1.7.11.7

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