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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>