diff options
Diffstat (limited to 'drivers/infiniband/hw')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_intr.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_intr.c b/drivers/infiniband/hw/ipath/ipath_intr.c index eac2e9c5528..4795cb895f8 100644 --- a/drivers/infiniband/hw/ipath/ipath_intr.c +++ b/drivers/infiniband/hw/ipath/ipath_intr.c @@ -954,7 +954,15 @@ static void handle_urcv(struct ipath_devdata *dd, u32 istat) int i; int rcvdint = 0; - /* test_bit below needs this... */ + /* + * test_and_clear_bit(IPATH_PORT_WAITING_RCV) and + * test_and_clear_bit(IPATH_PORT_WAITING_URG) below + * would both like timely updates of the bits so that + * we don't pass them by unnecessarily. the rmb() + * here ensures that we see them promptly -- the + * corresponding wmb()'s are in ipath_poll_urgent() + * and ipath_poll_next()... + */ rmb(); portr = ((istat >> INFINIPATH_I_RCVAVAIL_SHIFT) & dd->ipath_i_rcvavail_mask) |