diff options
| author | Ram Vepa <ram.vepa@qlogic.com> | 2011-12-23 08:01:43 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-12 11:29:23 -0800 |
| commit | 0d878668d0a4663a4807d413532f3a99496eebf4 (patch) | |
| tree | df85a05ba254aa8f8531503e3c6b3383b348fc9d /drivers/infiniband/hw/qib/qib_iba7322.c | |
| parent | ddcf85d72ffe4fd46239a94253fe04c114d4d1e2 (diff) | |
IB/qib: Fix a possible data corruption when receiving packets
commit eddfb675256f49d14e8c5763098afe3eb2c93701 upstream.
Prevent a receive data corruption by ensuring that the write to update
the rcvhdrheadn register to generate an interrupt is at the very end
of the receive processing.
Signed-off-by: Ramkrishna Vepa <ram.vepa@qlogic.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_iba7322.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_iba7322.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c index 1d5895941e19..5a070e8c983d 100644 --- a/drivers/infiniband/hw/qib/qib_iba7322.c +++ b/drivers/infiniband/hw/qib/qib_iba7322.c @@ -4082,10 +4082,12 @@ static void qib_update_7322_usrhead(struct qib_ctxtdata *rcd, u64 hd, */ if (hd >> IBA7322_HDRHEAD_PKTINT_SHIFT) adjust_rcv_timeout(rcd, npkts); - qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt); - qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt); if (updegr) qib_write_ureg(rcd->dd, ur_rcvegrindexhead, egrhd, rcd->ctxt); + mmiowb(); + qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt); + qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt); + mmiowb(); } static u32 qib_7322_hdrqempty(struct qib_ctxtdata *rcd) |