diff options
| author |   Vasanthy Kolluri <vkolluri@cisco.com> | 2010-03-18 16:19:44 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-03-18 21:22:47 -0700 |
| commit | a55a603dae47a1ea4fbfad3a3a428ea7a0900ab6 (patch) | |
| tree | e5a0526197efe4afb24443a2b918a8908ce11a43 /drivers/net/enic/vnic_rq.c | |
| parent | net: remove unused #include <linux/version.h> (diff) | |
| download | linux-dev-a55a603dae47a1ea4fbfad3a3a428ea7a0900ab6.tar.xz linux-dev-a55a603dae47a1ea4fbfad3a3a428ea7a0900ab6.zip | |
enic: Bug Fix: Fix hardware descriptor reads
The last bit written to a completion descriptor by hardware is the color
bit. Driver must read all other descriptor fields only after reading the
color bit to avoid reading stale descriptor fields. There is a rmb() after
reading the color bit to avoid any compiler/cpu reordering of the reads.
The color bit is the generation bit that toggles each pass through the
completion descriptor ring.
Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/enic/vnic_rq.c')
0 files changed, 0 insertions, 0 deletions