tree fbead04664dc846388acccaa4ed8c0ef456f506a
parent b02efbfc9a051b41e71fe8f94ddf967260e024a6
author Sagi Grimberg <sagig@mellanox.com> 1417532251 +0200
committer Nicholas Bellinger <nab@linux-iscsi.org> 1418455900 -0800

iser-target: Allocate PI contexts dynamically

This patch converts to allocate PI contexts dynamically in order
avoid a potentially bogus np->tpg_np and associated NULL pointer
dereference in isert_connect_request() during iser-target endpoint
shutdown with multiple network portals.

Also, there is really no need to allocate these at connection
establishment since it is not guaranteed that all the IOs on
that connection will be to a PI formatted device.

We can do it in a lazy fashion so the initial burst will have a
transient slow down, but very fast all IOs will allocate a PI
context.

Squashed:

iser-target: Centralize PI context handling code

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Cc: <stable@vger.kernel.org> # v3.14+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>