NTB: correct memory barrier
mmiowb is not sufficient to flush the data and is causing data
corruption. Change to wmb and the data corruption is no more.
Signed-off-by: Jon Mason <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 1d17857..e9666bd 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -1009,7 +1009,7 @@
hdr->ver = qp->tx_pkts;
/* Ensure that the data is fully copied out before setting the flag */
- mmiowb();
+ wmb();
hdr->flags = entry->flags | DESC_DONE_FLAG;
ntb_ring_sdb(qp->ndev, qp->qp_num);