# \[PATCH 2/2\] drivers/net/phy/mdio-bitbang.c: Call mdiobus\_unregister before mdiobus\_free - From: Peter Senna Tschudin \ - Date: 2012-10-28 16:12:38 - List: netdev - Page: https://ratatoskr.run/netdev/2012/10/3947234 - Thread: https://ratatoskr.run/netdev/2012/10/3947233/t.md ```text 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/): // @@ expression E; @@ ... when != mdiobus_unregister(E); + mdiobus_unregister(E); mdiobus_free(E); // Signed-off-by: Peter Senna Tschudin --- 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 ```