tree 4babc9d1979fd71c88b2ca95a57cd2b89a119423
parent 2753166e4be9df4677745a7f7d9d8daa94938a08
author Eric Dumazet <edumazet@google.com> 1537568864 -0700
committer David S. Miller <davem@davemloft.net> 1537764924 -0700

igb: 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.

igb 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: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>