myri10ge: add barrier in myri10ge_send_cmd

Add a barrier() in the usleep() loop in  myri10ge_send_cmd().
Without the barrier, some mips machine never notices that the
firmware has DMA'ed the response.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Andrew Gallatin <gallatin@myri.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 4a65e4155c0f..48fe624afa53 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -361,8 +361,10 @@ myri10ge_send_cmd(struct myri10ge_priv *mgp, u32 cmd,
                 for (sleep_total = 0;
                      sleep_total < 1000
                      && response->result == htonl(MYRI10GE_NO_RESPONSE_RESULT);
-                     sleep_total += 10)
+                     sleep_total += 10) {
                         udelay(10);
+                        mb();
+                }
         } else {
                 /* use msleep for most command */
                 for (sleep_total = 0;