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i40iw: Fix incorrect assignment of SQ head

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The SQ head is incorrectly incremented when the number
of WQEs required is greater than the number available.
The fix is to use the I40IW_RING_MOV_HEAD_BY_COUNT
macro. This checks for the SQ full condition first and
only if SQ has room for the request, then we move the
head appropriately.

Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Henry Orosco <henry.orosco@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Henry Orosco 2016-11-22 09:44:20 -06:00 committed by Doug Ledford
parent 78e945aace
commit d4165e3abd
1 changed files with 4 additions and 6 deletions
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10
drivers/infiniband/hw/i40iw/i40iw_uk.c
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@ -175,12 +175,10 @@ u64 *i40iw_qp_get_next_send_wqe(struct i40iw_qp_uk *qp,
if (!*wqe_idx)
qp->swqe_polarity = !qp->swqe_polarity;
}
for (i = 0; i < wqe_size / I40IW_QP_WQE_MIN_SIZE; i++) {
I40IW_RING_MOVE_HEAD(qp->sq_ring, ret_code);
if (ret_code)
return NULL;
}
I40IW_RING_MOVE_HEAD_BY_COUNT(qp->sq_ring,
wqe_size / I40IW_QP_WQE_MIN_SIZE, ret_code);
if (ret_code)
return NULL;
wqe = qp->sq_base[*wqe_idx].elem;