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Revert "e1000e: fix cyclic resets at link up with active tx" 

This reverts commit 0f9e980bf5.

That change cased false-positive warning about hardware hang:

e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
e1000e 0000:00:1f.6 eth0: Detected Hardware Unit Hang:
   TDH                  <0>
   TDT                  <1>
   next_to_use          <1>
   next_to_clean        <0>
buffer_info[next_to_clean]:
   time_stamp           <fffba7a7>
   next_to_watch        <0>
   jiffies              <fffbb140>
   next_to_watch.status <0>
MAC Status             <40080080>
PHY Status             <7949>
PHY 1000BASE-T Status  <0>
PHY Extended Status    <3000>
PCI Status             <10>
e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx

Besides warning everything works fine.
Original issue will be fixed property in following patch.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reported-by: Joseph Yasi <joe.yasi@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=203175
Tested-by: Joseph Yasi <joe.yasi@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Tested-by: Oleksandr Natalenko <oleksandr@redhat.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Konstantin Khlebnikov 2019-04-17 11:13:16 +03:00 committed by Jeff Kirsher
parent 16ecd8d9af
commit caff422ea8
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@ -5308,13 +5308,8 @@ static void e1000_watchdog_task(struct work_struct *work)
/* 8000ES2LAN requires a Rx packet buffer work-around
* on link down event; reset the controller to flush
* the Rx packet buffer.
*
* If the link is lost the controller stops DMA, but
* if there is queued Tx work it cannot be done. So
* reset the controller to flush the Tx packet buffers.
*/
if ((adapter->flags & FLAG_RX_NEEDS_RESTART) ||
e1000_desc_unused(tx_ring) + 1 < tx_ring->count)
if (adapter->flags & FLAG_RX_NEEDS_RESTART)
adapter->flags |= FLAG_RESTART_NOW;
else
pm_schedule_suspend(netdev->dev.parent,
@ -5337,6 +5332,14 @@ static void e1000_watchdog_task(struct work_struct *work)
adapter->gotc_old = adapter->stats.gotc;
spin_unlock(&adapter->stats64_lock);
/* If the link is lost the controller stops DMA, but
* if there is queued Tx work it cannot be done. So
* reset the controller to flush the Tx packet buffers.
*/
if (!netif_carrier_ok(netdev) &&
(e1000_desc_unused(tx_ring) + 1 < tx_ring->count))
adapter->flags |= FLAG_RESTART_NOW;
/* If reset is necessary, do it outside of interrupt context. */
if (adapter->flags & FLAG_RESTART_NOW) {
schedule_work(&adapter->reset_task);