From: Dan Carpenter dan.carpenter@oracle.com
stable inclusion from linux-4.19.195 commit acb503deb002ca30e1544dade6059d9cd5d746bd
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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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/net/phy/mdio_bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index c5588d4508f97..5f25da904eba8 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -445,7 +445,8 @@ 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++) {