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[ Upstream commit284fb78ed7] Initialize mutex before use. Avoid kernel complaint when CONFIG_DEBUG_LOCK_ALLOC is enabled. Fixes:b987e98e50("dsa: add DSA switch driver for Microchip KSZ9477") Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com> Reviewed-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>