i40iw: Fix incorrect assignment of SQ head

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>

diff --git a/drivers/infiniband/hw/i40iw/i40iw_uk.c b/drivers/infiniband/hw/i40iw/i40iw_uk.c
index 5d9c3bfb73103bf534b393c5d758b5e39e8c9a25..4376cd628774248dbc18e7bf1ea731dcede4945c 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw_uk.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_uk.c
@@ -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;