IB/ipath: Fix many locking issues when switching to error state

The send DMA hardware queue voided a number of prior assumptions about
when a send is complete which led to completions being generated out of
order.  There were also a number of locking issues when switching the QP
to the error or reset states, and we implement the IB_QPS_SQD state.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --cc drivers/infiniband/hw/ipath/ipath_qp.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_rc.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_ruc.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_uc.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_ud.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_user_sdma.h
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_verbs.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_verbs.h
Simple merge