e1000e: Fix e1000_check_for_copper_link_ich8lan return value.
authorBenjamin Poirier <bpoirier@suse.com>
Mon, 11 Dec 2017 07:26:40 +0000 (16:26 +0900)
committerBen Hutchings <ben@decadent.org.uk>
Sat, 3 Mar 2018 15:50:54 +0000 (15:50 +0000)
commit 4110e02eb45ea447ec6f5459c9934de0a273fb91 upstream.

e1000e_check_for_copper_link() and e1000_check_for_copper_link_ich8lan()
are the two functions that may be assigned to mac.ops.check_for_link when
phy.media_type == e1000_media_type_copper. Commit 19110cfbb34d ("e1000e:
Separate signaling for link check/link up") changed the meaning of the
return value of check_for_link for copper media but only adjusted the first
function. This patch adjusts the second function likewise.

Reported-by: Christian Hesse <list@eworm.de>
Reported-by: Gabriel C <nix.or.die@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=198047
Fixes: 19110cfbb34d ("e1000e: Separate signaling for link check/link up")
Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Tested-by: Christian Hesse <list@eworm.de>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
[bwh: Backported to 3.2: e1000_check_for_copper_link() has a single return
 statement for success and error cases, so set ret_val in the link-up
 case instead of changing that statement.]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
drivers/net/ethernet/intel/e1000e/ich8lan.c

index e2a80a2..72b994e 100644 (file)
@@ -657,6 +657,9 @@ out:
  *  Checks to see of the link status of the hardware has changed.  If a
  *  change in link status has been detected, then we read the PHY registers
  *  to get the current speed/duplex if link exists.
+ *
+ *  Returns a negative error code (-E1000_ERR_*) or 0 (link down) or 1 (link
+ *  up).
  **/
 static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
 {
@@ -672,7 +675,7 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
         * Change or Rx Sequence Error interrupt.
         */
        if (!mac->get_link_status) {
-               ret_val = 0;
+               ret_val = 1;
                goto out;
        }
 
@@ -761,9 +764,12 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
         * different link partner.
         */
        ret_val = e1000e_config_fc_after_link_up(hw);
-       if (ret_val)
+       if (ret_val) {
                e_dbg("Error configuring flow control\n");
+               return ret_val;
+       }
 
+       ret_val = 1;
 out:
        return ret_val;
 }