netdev - [net-next 11/17] i40e: fix for PHY NVM interaction problem

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Message-Id: <1445059711-45992-12-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Fri, 16 Oct 2015 22:28:25 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 11/17] i40e: fix for PHY NVM interaction problem

From: Carolyn Wyborny <carolyn.wyborny@...el.com>

This patch fixes a problem where the NVMUpdate Tool, when using the PHY
NVM feature, gets bad data from the PHY because of contention on the
MDIO interface from get PHY capability calls from the driver during
regular operations.  The problem is fixed by adding a check if media
is available before calling get PHY capability function because that
bit is not set when device is in PHY interaction mode.

Change-ID: Ib89991b0f841808dd92410f5e8683d6ee3301cd0
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_common.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 7f456e9..c51f2fb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -2278,13 +2278,15 @@ i40e_status i40e_update_link_info(struct i40e_hw *hw)
 	if (status)
 		return status;
 
-	status = i40e_aq_get_phy_capabilities(hw, false, false, &abilities,
-					      NULL);
-	if (status)
-		return status;
+	if (hw->phy.link_info.link_info & I40E_AQ_MEDIA_AVAILABLE) {
+		status = i40e_aq_get_phy_capabilities(hw, false, false,
+						      &abilities, NULL);
+		if (status)
+			return status;
 
-	memcpy(hw->phy.link_info.module_type, &abilities.module_type,
-	       sizeof(hw->phy.link_info.module_type));
+		memcpy(hw->phy.link_info.module_type, &abilities.module_type,
+		       sizeof(hw->phy.link_info.module_type));
+	}
 
 	return status;
 }
-- 
2.4.3

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