aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/ipath/ipath_verbs.c
diff options
context:
space:
mode:
authorRalph Campbell <ralph.campbell@qlogic.com>2007-07-06 12:48:23 -0700
committerRoland Dreier <rolandd@cisco.com>2007-07-09 20:12:26 -0700
commit4fc570bcbe77f823aae183dd824869f79e74cc97 (patch)
tree3955946608a973b06db8b7e5b3ec319354a6fa73 /drivers/infiniband/hw/ipath/ipath_verbs.c
parent06cc85086e6896939f8c68f8518224748f6b0b2f (diff)
IB/ipath: Add barrier before updating WC head in shared memory
Add a barrier to make sure the CPU doesn't reorder writes to memory, since user programs can be polling on the head index update and the entry should be written before that. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_verbs.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_verbs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index 0aecded6af8..c76ea0e0b02 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -327,6 +327,8 @@ static int ipath_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
wqe->num_sge = wr->num_sge;
for (i = 0; i < wr->num_sge; i++)
wqe->sg_list[i] = wr->sg_list[i];
+ /* Make sure queue entry is written before the head index. */
+ smp_wmb();
wq->head = next;
spin_unlock_irqrestore(&qp->r_rq.lock, flags);
}