tree 29c9e1a705304424084678266ea7fec916fe8c6a
parent 99e87f56b48f490fb16b6e0f74691c1e664dea95
author Igor Druzhinin <igor.druzhinin@citrix.com> 1551363086 +0000
committer David S. Miller <davem@davemloft.net> 1551387037 -0800

xen-netback: don't populate the hash cache on XenBus disconnect

Occasionally, during the disconnection procedure on XenBus which
includes hash cache deinitialization there might be some packets
still in-flight on other processors. Handling of these packets includes
hashing and hash cache population that finally results in hash cache
data structure corruption.

In order to avoid this we prevent hashing of those packets if there
are no queues initialized. In that case RCU protection of queues guards
the hash cache as well.

Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>