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[ Upstream commit f154be241d22298d2b63c9b613f619fa1086ea75 ] Commit448b4482c6("net: dsa: Add lockdep class to tx queues to avoid lockdep splat") removed the netif_device_detach() call done in dsa_slave_suspend() which is necessary, and paired with a corresponding netif_device_attach(), bring it back. Fixes:448b4482c6("net: dsa: Add lockdep class to tx queues to avoid lockdep splat") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>