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net: mdiobus: get rid of a BUG_ON()

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[ Upstream commit 1dde47a66d4fb181830d6fa000e5ea86907b639e ]

We spotted a bug recently during a review where a driver was
unregistering a bus that wasn't registered, which would trigger this
BUG_ON().  Let's handle that situation more gracefully, and just print
a warning and return.

Reported-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2021-05-17 12:04:13 +03:00 • committed by Greg Kroah-Hartman
commit e29d22371d
1 changed files with 2 additions and 1 deletions
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3
drivers/net/phy/mdio_bus.c
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@ -453,7 +453,8 @@ void mdiobus_unregister(struct mii_bus *bus)
struct mdio_device *mdiodev;
int i;
BUG_ON(bus->state != MDIOBUS_REGISTERED);
if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))
return;
bus->state = MDIOBUS_UNREGISTERED;
for (i = 0; i < PHY_MAX_ADDR; i++) {