sky2: avoid reserved regions on ethtool reg dump

On Yukon EX reading some of the undocumented places in the
memory space will cause a hang. Since they don't provide useful
information, just skip the reserved areas.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index fe01b961b597..612257172b95 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -3330,7 +3330,7 @@ static int sky2_get_regs_len(struct net_device *dev)
 
 /*
  * Returns copy of control register region
- * Note: access to the RAM address register set will cause timeouts.
+ * Note: ethtool_get_regs always provides full size (16k) buffer
  */
 static void sky2_get_regs(struct net_device *dev, struct ethtool_regs *regs,
                           void *p)
@@ -3338,15 +3338,19 @@ static void sky2_get_regs(struct net_device *dev, struct ethtool_regs *regs,
         const struct sky2_port *sky2 = netdev_priv(dev);
         const void __iomem *io = sky2->hw->regs;
 
-        BUG_ON(regs->len < B3_RI_WTO_R1);
         regs->version = 1;
         memset(p, 0, regs->len);
 
         memcpy_fromio(p, io, B3_RAM_ADDR);
 
-        memcpy_fromio(p + B3_RI_WTO_R1,
-                      io + B3_RI_WTO_R1,
-                      regs->len - B3_RI_WTO_R1);
+        /* skip diagnostic ram region */
+        memcpy_fromio(p + B3_RI_WTO_R1, io + B3_RI_WTO_R1, 0x2000 - B3_RI_WTO_R1);
+
+        /* copy GMAC registers */
+        memcpy_fromio(p + BASE_GMAC_1, io + BASE_GMAC_1, 0x1000);
+        if (sky2->hw->ports > 1)
+                memcpy_fromio(p + BASE_GMAC_2, io + BASE_GMAC_2, 0x1000);
+
 }
 
 /* In order to do Jumbo packets on these chips, need to turn off the