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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>
This commit is contained in:
Jon Mason 2013-01-19 02:02:17 -07:00 committed by Greg Kroah-Hartman
parent 8222b402e2
commit 842c1ddea5
1 changed files with 1 additions and 1 deletions
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2
drivers/ntb/ntb_transport.c
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@ -1009,7 +1009,7 @@ static void ntb_tx_copy_task(struct ntb_transport_qp *qp,
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);