[PATCH 3.11 202/208] igb: Fix for issue where values could be too high for udelay function.

[Luis Henriques]

3.11.10.2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Carolyn Wyborny <carolyn.wyborny at intel.com>

commit df29df92adda751ac04ca5149d30014b5199db81 upstream.

This patch changes the igb_phy_has_link function to check the value of the
parameter before deciding to use udelay or mdelay in order to be sure that
the value is not too high for udelay function.

Signed-off-by: Sunil K Pandey <sunil.k.pandey at intel.com>
Signed-off-by: Kevin B Smith <kevin.b.smith at intel.com>
Signed-off-by: Carolyn Wyborny <carolyn.wyborny at intel.com>
Tested-by: Aaron Brown <aaron.f.brown at intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/ethernet/intel/igb/e1000_phy.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/e1000_phy.c b/drivers/net/ethernet/intel/igb/e1000_phy.c
index 6046194..4703d45 100644
--- a/drivers/net/ethernet/intel/igb/e1000_phy.c
+++ b/drivers/net/ethernet/intel/igb/e1000_phy.c
@@ -1719,7 +1719,10 @@ s32 igb_phy_has_link(struct e1000_hw *hw, u32 iterations,
 			 * ownership of the resources, wait and try again to
 			 * see if they have relinquished the resources yet.
 			 */
-			udelay(usec_interval);
+			if (usec_interval >= 1000)
+				mdelay(usec_interval/1000);
+			else
+				udelay(usec_interval);
 		}
 		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
 		if (ret_val)
-- 
1.8.3.2