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authorBruce Allan <bruce.w.allan@intel.com>2009-07-01 13:28:50 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-03 20:09:39 -0700
commit906e8d9792b1c4a8b58c1383f4c00fc4c9936fc3 (patch)
treed5d12aa0a373b3d9cb8ce072d64d3bdeffaa7400 /drivers/net/e1000e/phy.c
parent28c9195a570a32de2760310ca278d44a4fd060a4 (diff)
e1000e: delay second read of PHY_STATUS register on failure of first read
Some PHYs may require two reads of the PHY_STATUS register to determine the link status. If the PHY is being accessed by another thread it is possible the first read could timeout and fail. In this case, put a delay in so the second read will pick up the correct link status. Signed-off-by: Bruce Allan <bruce.w.allan@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000e/phy.c')
-rw-r--r--drivers/net/e1000e/phy.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/e1000e/phy.c b/drivers/net/e1000e/phy.c
index d8453946bff..994401fd066 100644
--- a/drivers/net/e1000e/phy.c
+++ b/drivers/net/e1000e/phy.c
@@ -1531,7 +1531,12 @@ s32 e1000e_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
*/
ret_val = e1e_rphy(hw, PHY_STATUS, &phy_status);
if (ret_val)
- break;
+ /*
+ * If the first read fails, another entity may have
+ * ownership of the resources, wait and try again to
+ * see if they have relinquished the resources yet.
+ */
+ udelay(usec_interval);
ret_val = e1e_rphy(hw, PHY_STATUS, &phy_status);
if (ret_val)
break;