[PATCH] b44: disable default tx pause

Disable default tx pause frame support.
The b44 controller has a bug that generates excessive tx pause
frames.

Signed-off-by: Gary Zambrano <zambrano@broadcom.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 12 insertions, 19 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index c4e12b5cbb92..a67d537ccf49 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -410,25 +410,18 @@ static void __b44_set_flow_ctrl(struct b44 *bp, u32 pause_flags)
 
 static void b44_set_flow_ctrl(struct b44 *bp, u32 local, u32 remote)
 {
-        u32 pause_enab = bp->flags & (B44_FLAG_TX_PAUSE |
-                                      B44_FLAG_RX_PAUSE);
-
-        if (local & ADVERTISE_PAUSE_CAP) {
-                if (local & ADVERTISE_PAUSE_ASYM) {
-                        if (remote & LPA_PAUSE_CAP)
-                                pause_enab |= (B44_FLAG_TX_PAUSE |
-                                               B44_FLAG_RX_PAUSE);
-                        else if (remote & LPA_PAUSE_ASYM)
-                                pause_enab |= B44_FLAG_RX_PAUSE;
-                } else {
-                        if (remote & LPA_PAUSE_CAP)
-                                pause_enab |= (B44_FLAG_TX_PAUSE |
-                                               B44_FLAG_RX_PAUSE);
-                }
-        } else if (local & ADVERTISE_PAUSE_ASYM) {
-                if ((remote & LPA_PAUSE_CAP) &&
-                    (remote & LPA_PAUSE_ASYM))
-                        pause_enab |= B44_FLAG_TX_PAUSE;
+        u32 pause_enab = 0; 
+
+        /* The driver supports only rx pause by default because
+           the b44 mac tx pause mechanism generates excessive 
+           pause frames.           
+           Use ethtool to turn on b44 tx pause if necessary.
+         */
+        if ((local & ADVERTISE_PAUSE_CAP) &&
+            (local & ADVERTISE_PAUSE_ASYM)){ 
+                if ((remote & LPA_PAUSE_ASYM) &&
+                    !(remote & LPA_PAUSE_CAP))
+                        pause_enab |= B44_FLAG_RX_PAUSE;
         }
 
         __b44_set_flow_ctrl(bp, pause_enab);