diff options
| author |   Ram Vepa <ram.vepa@qlogic.com> | 2011-12-23 08:01:43 -0500 |
|---|---|---|
| committer |   Roland Dreier <roland@purestorage.com> | 2012-01-03 20:53:02 -0800 |
| commit | eddfb675256f49d14e8c5763098afe3eb2c93701 (patch) | |
| tree | fefe361432c162a48f98076f7156920e083c42fb /drivers/infiniband/hw/qib/qib_iba7220.c | |
| parent | IB/qib: Eliminate 64-bit jiffies use (diff) | |
| download | linux-dev-eddfb675256f49d14e8c5763098afe3eb2c93701.tar.xz linux-dev-eddfb675256f49d14e8c5763098afe3eb2c93701.zip | |
IB/qib: Fix a possible data corruption when receiving packets
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>
Cc: <stable@kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_iba7220.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_iba7220.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_iba7220.c b/drivers/infiniband/hw/qib/qib_iba7220.c index 9dd886cc633a..3c722f79d6f6 100644 --- a/drivers/infiniband/hw/qib/qib_iba7220.c +++ b/drivers/infiniband/hw/qib/qib_iba7220.c @@ -2725,9 +2725,11 @@ static int qib_7220_set_loopback(struct qib_pportdata *ppd, const char *what) static void qib_update_7220_usrhead(struct qib_ctxtdata *rcd, u64 hd, u32 updegr, u32 egrhd, u32 npkts) { - 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); + mmiowb(); } static u32 qib_7220_hdrqempty(struct qib_ctxtdata *rcd) |