MFC r344920:
Teardown ifnet after stopping port in the mlx4en(4) driver.

mlx4_en_stop_port() calls mlx4_en_put_qp() which can refer the link level
address of the network interface, which in turn wil

MFC r344920:
Teardown ifnet after stopping port in the mlx4en(4) driver.

mlx4_en_stop_port() calls mlx4_en_put_qp() which can refer the link level
address of the network interface, which in turn will be freed by the
network interface detach function. Make sure the port is stopped
before detaching the network interface.

Sponsored by: Mellanox Technologies

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MFC r344919:
Don't hold state lock while detaching network device instance in mlx4en(4).

It can happen during shutdown that the lock will recurse when the mlx4en(4)
instance is part of a lagg interf

MFC r344919:
Don't hold state lock while detaching network device instance in mlx4en(4).

It can happen during shutdown that the lock will recurse when the mlx4en(4)
instance is part of a lagg interface. Call ether_ifdetach() unlocked.

Backtrace:
panic(): _sx_xlock_hard: recursed on non-recursive sx &mdev->state_lock
_sx_xlock_hard()
_sx_xlock()
mlx4_en_ioctl()
if_setlladdr()
lagg_port_destroy()
lagg_port_ifdetach()
if_detach()
mlx4_en_destroy_netdev()
mlx4_en_remove()
mlx4_remove_device()
mlx4_unregister_device()
mlx4_unload_one()
mlx4_shutdown()
linux_pci_shutdown()
bus_generic_shutdown()

Sponsored by: Mellanox Technologies

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