Commit 19110cfb authored by Benjamin Poirier's avatar Benjamin Poirier Committed by Jeff Kirsher

e1000e: Separate signaling for link check/link up

Lennart reported the following race condition:

\ e1000_watchdog_task
    \ e1000e_has_link
        \ hw->mac.ops.check_for_link() === e1000e_check_for_copper_link
            /* link is up */
            mac->get_link_status = false;

                            /* interrupt */
                            \ e1000_msix_other
                                hw->mac.get_link_status = true;

        link_active = !hw->mac.get_link_status
        /* link_active is false, wrongly */

This problem arises because the single flag get_link_status is used to
signal two different states: link status needs checking and link status is
down.

Avoid the problem by using the return value of .check_for_link to signal
the link status to e1000e_has_link().
Reported-by: default avatarLennart Sorensen <lsorense@csclub.uwaterloo.ca>
Signed-off-by: default avatarBenjamin Poirier <bpoirier@suse.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent d3509f8b
......@@ -410,6 +410,9 @@ void e1000e_clear_hw_cntrs_base(struct e1000_hw *hw)
* 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).
**/
s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
{
......@@ -423,7 +426,7 @@ s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
* Change or Rx Sequence Error interrupt.
*/
if (!mac->get_link_status)
return 0;
return 1;
/* First we want to see if the MII Status Register reports
* link. If so, then we want to get the current speed/duplex
......@@ -461,10 +464,12 @@ s32 e1000e_check_for_copper_link(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;
}
return 1;
}
/**
......
......@@ -5081,7 +5081,7 @@ static bool e1000e_has_link(struct e1000_adapter *adapter)
case e1000_media_type_copper:
if (hw->mac.get_link_status) {
ret_val = hw->mac.ops.check_for_link(hw);
link_active = !hw->mac.get_link_status;
link_active = ret_val > 0;
} else {
link_active = true;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment