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Diffstat (limited to 'drivers/net/enic/vnic_wq.h')
-rw-r--r--drivers/net/enic/vnic_wq.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/enic/vnic_wq.h b/drivers/net/enic/vnic_wq.h
index 7081828..c826137 100644
--- a/drivers/net/enic/vnic_wq.h
+++ b/drivers/net/enic/vnic_wq.h
@@ -108,8 +108,15 @@ static inline void vnic_wq_post(struct vnic_wq *wq,
buf->len = len;
buf = buf->next;
- if (eop)
+ if (eop) {
+ /* Adding write memory barrier prevents compiler and/or CPU
+ * reordering, thus avoiding descriptor posting before
+ * descriptor is initialized. Otherwise, hardware can read
+ * stale descriptor fields.
+ */
+ wmb();
iowrite32(buf->index, &wq->ctrl->posted_index);
+ }
wq->to_use = buf;
wq->ring.desc_avail--;
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