[PATCH net 04/10] ice: wait for reset completion in ice_resume()

From: Aaron Ma <redacted>

ice_resume() schedules an asynchronous PF reset and returns
immediately. The reset runs later in ice_service_task(). If
userspace tries to bring up the net device before the reset
finishes, ice_open() fails with -EBUSY:

  ice_resume()
    ice_schedule_reset()          # sets ICE_PFR_REQ, returns
  ...
  ice_open()
    ice_is_reset_in_progress()    # ICE_PFR_REQ still set, -EBUSY
  ...
  ice_service_task()
    ice_do_reset()
      ice_rebuild()               # clears ICE_PFR_REQ, too late

Reproduced on E800 series NICs during suspend/resume with irdma
enabled, where the aux device probe widens the race window.

  ice 0000:81:00.0: can't open net device while reset is in progress

Add a best-effort wait (10s timeout, matching ice_devlink_info_get())
for the reset to complete before returning from ice_resume(). In
practice the reset completes in ~300ms.

Fixes: 769c500dcc1e ("ice: Add advanced power mgmt for WoL")
Cc: stable@vger.kernel.org
Reviewed-by: Kohei Enju <redacted>
Reviewed-by: Aleksandr Loktionov <redacted>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Aaron Ma <redacted>
Tested-by: Alexander Nowlin <redacted>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
There were comments from Paolo which Aaron responded:
https://lore.kernel.org/netdev/CAJ6xRxVwD9nLk96y6-HNSFt1AL8o=24UMUGxCYZdht2_+36Xhg@mail.gmail.com/ (local)

 drivers/net/ethernet/intel/ice/ice_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index e2fd2dab03e3..d88835482d3a 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c

@@ -5637,6 +5637,16 @@ static int ice_resume(struct device *dev)
 	/* Restart the service task */
 	mod_timer(&pf->serv_tmr, round_jiffies(jiffies + pf->serv_tmr_period));
 
+	/* Best-effort wait for the scheduled reset to finish so that the
+	 * device is operational before returning. Without this, userspace
+	 * (e.g. NetworkManager) may try to open the net device while the
+	 * asynchronous reset is still in progress, hitting -EBUSY.
+	 */
+	ret = ice_wait_for_reset(pf, secs_to_jiffies(10));
+	if (ret)
+		dev_err(dev, "Wait for reset timed out (10s) during resume: %d\n",
+			ret);
+
 	return 0;
 }
 

-- 
2.47.1