mlx4: remove ndo_poll_controller
authorEric Dumazet <edumazet@google.com>
Fri, 21 Sep 2018 22:27:47 +0000 (15:27 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 24 Sep 2018 04:55:25 +0000 (21:55 -0700)
commita24b66c249f71dde11da5ba3b4c397a42ece3fc9
tree835522e28b2f97de15b77647708d70c60aea95d2
parent1aa28fb98368078bcaf527bf46c0e001db934414
mlx4: remove ndo_poll_controller

As diagnosed by Song Liu, ndo_poll_controller() can
be very dangerous on loaded hosts, since the cpu
calling ndo_poll_controller() might steal all NAPI
contexts (for all RX/TX queues of the NIC). This capture
can last for unlimited amount of time, since one
cpu is generally not able to drain all the queues under load.

mlx4 uses NAPI for TX completions, so we better let core
networking stack call the napi->poll() to avoid the capture.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/mellanox/mlx4/en_netdev.c