[PATCH 2/2] ethernet: igb: e1000_phy: Check for ops.force_speed_duplex existence

[Paul Menzel]

From: Jeffrey Townsend <jeffrey.townsend@xxxxxxxxxxxxx>

The ops field might no be defined, so add a check.

The patch is taken from Open Network Linux (ONL), and it was added there
as part of the patch

    packages/base/any/kernels/3.16+deb8/patches/driver-support-intel-igb-bcm5461X-phy.patch

in ONL commit f32316c63c (Support the BCM54616 and BCM5461S.) [1]. Part
of this commit was already upstreamed in Linux commit eeb0149660 (igb:
support BCM54616 PHY) in 2017.

I applied the forward-ported

    packages/base/any/kernels/5.4-lts/patches/0002-driver-support-intel-igb-bcm5461S-phy.patch

added in ONL commit 5ace6bcdb3 (Add 5.4 LTS kernel build.) [2].

[1]: https://github.com/opencomputeproject/OpenNetworkLinux/commit/f32316c63ce3a64de125b7429115c6d45e942bd1
[2]: https://github.com/opencomputeproject/OpenNetworkLinux/commit/5ace6bcdb37cb8065dcd1d4404b3dcb6424f6331

Cc: Jeffrey Townsend <jeffrey.townsend@xxxxxxxxxxxxx>
Cc: John W Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/igb/e1000_phy.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/e1000_phy.c b/drivers/net/ethernet/intel/igb/e1000_phy.c
index 4e0b4ba09a00..4151e55a6d2a 100644
--- a/drivers/net/ethernet/intel/igb/e1000_phy.c
+++ b/drivers/net/ethernet/intel/igb/e1000_phy.c
@@ -1107,11 +1107,13 @@ s32 igb_setup_copper_link(struct e1000_hw *hw)
 		/* PHY will be set to 10H, 10F, 100H or 100F
 		 * depending on user settings.
 		 */
-		hw_dbg("Forcing Speed and Duplex\n");
-		ret_val = hw->phy.ops.force_speed_duplex(hw);
-		if (ret_val) {
-			hw_dbg("Error Forcing Speed and Duplex\n");
-			goto out;
+		if (hw->phy.ops.force_speed_duplex) {
+			hw_dbg("Forcing Speed and Duplex\n");
+			ret_val = hw->phy.ops.force_speed_duplex(hw);
+			if (ret_val) {
+				hw_dbg("Error Forcing Speed and Duplex\n");
+				goto out;
+			}
 		}
 	}
 
-- 
2.29.1