iser-target: Fix pending connections handling in target stack shutdown sequnce
Instead of handing a connection to the iscsi stack
for processing right after accepting (rdma_accept) we only hand
the connection to the iscsi core after we reached to a connected
state (ESTABLISHED CM event). This will prevent two error scenrios:
1. race between rdma connection teardown and iscsi login sequence
reported by Nic in: (ce9a9fc20a78a "iser-target: Fix REJECT CM event
use-after-free OOPs")
2. target stack shutdown sequence race with constant login attempts by
multiple initiators.
We address this by maintaining two queues at the isert_np level:
- accepted: connections that were accepted but have not reached
connected state (might get rejected, unreachable or error).
- pending: connections in connected state, but have yet to handed
to the iscsi core for login processing. iser connections are promoted
to the pending queue only from the accepted queue.
This way the iscsi core now will only handle functional iser connections
and once we shutdown the target stack, we look for any stales that
got left behind so we can safely release them.
Signed-off-by: Jenny Derzhavetz <jennyf@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2 files changed