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| author | Arthur Jones <arthur.jones@qlogic.com> | 2007-10-17 18:18:29 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-01-25 14:15:28 -0800 |
| commit | 2f01a7001131bbf3ce1e39252bf72aea2da034df (patch) | |
| tree | 926b215a1da4cd9c6956306b187507ea0c5ae185 /drivers | |
| parent | 6276980138292056aab162f7eb98afe5243b2976 (diff) | |
| download | linux-2f01a7001131bbf3ce1e39252bf72aea2da034df.tar.gz linux-2f01a7001131bbf3ce1e39252bf72aea2da034df.tar.bz2 linux-2f01a7001131bbf3ce1e39252bf72aea2da034df.zip | |
IB/ipath: Better comment for rmb() in ipath_intr()
An internal code review found the comment here lacking -- update it with
more specifics of how and why the rmb() is there.
Signed-off-by: Arthur Jones <arthur.jones@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers')
| -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 eac2e9c55281..4795cb895f85 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) |