[Intel-wired-lan] [bug report] igc: Add initial LTR support

[dan.carpenter@oracle.com <dan.carpenter@oracle.com>]

Hello Sasha Neftin,

The patch 707abf069548: "igc: Add initial LTR support" from Jun 2,
2020, leads to the following static checker warning:

	drivers/net/ethernet/intel/igc/igc_mac.c:424 igc_check_for_copper_link()
	error: uninitialized symbol 'link'.

drivers/net/ethernet/intel/igc/igc_mac.c
   363  s32 igc_check_for_copper_link(struct igc_hw *hw)
   364  {
   365          struct igc_mac_info *mac = &hw->mac;
   366          s32 ret_val;
   367          bool link;
                ^^^^^^^^^

   368  
   369          /* We only want to go out to the PHY registers to see if Auto-Neg
   370           * has completed and/or if our link status has changed.  The
   371           * get_link_status flag is set upon receiving a Link Status
   372           * Change or Rx Sequence Error interrupt.
   373           */
   374          if (!mac->get_link_status) {
   375                  ret_val = 0;
   376                  goto out;
                        ^^^^^^^^

   377          }
   378  
   379          /* First we want to see if the MII Status Register reports
   380           * link.  If so, then we want to get the current speed/duplex
   381           * of the PHY.
   382           */
   383          ret_val = igc_phy_has_link(hw, 1, 0, &link);
   384          if (ret_val)
   385                  goto out;
   386  
   387          if (!link)
   388                  goto out; /* No link detected */
   389  
   390          mac->get_link_status = false;
   391  
   392          /* Check if there was DownShift, must be checked
   393           * immediately after link-up
   394           */
   395          igc_check_downshift(hw);
   396  
   397          /* If we are forcing speed/duplex, then we simply return since
   398           * we have already determined whether we have link or not.
   399           */
   400          if (!mac->autoneg) {
   401                  ret_val = -IGC_ERR_CONFIG;
   402                  goto out;
   403          }
   404  
   405          /* Auto-Neg is enabled.  Auto Speed Detection takes care
   406           * of MAC speed/duplex configuration.  So we only need to
   407           * configure Collision Distance in the MAC.
   408           */
   409          igc_config_collision_dist(hw);
   410  
   411          /* Configure Flow Control now that Auto-Neg has completed.
   412           * First, we need to restore the desired flow control
   413           * settings because we may have had to re-autoneg with a
   414           * different link partner.
   415           */
   416          ret_val = igc_config_fc_after_link_up(hw);
   417          if (ret_val)
   418                  hw_dbg("Error configuring flow control\n");
   419  
   420  out:
   421          /* Now that we are aware of our link settings, we can set the LTR
   422           * thresholds.
   423           */
   424          ret_val = igc_set_ltr_i225(hw, link);
                                               ^^^^
Uninitialized.

   425  
   426          return ret_val;
   427  }

regards,
dan carpenter