[PATCH v2] ice: wait for reset completion in ice_resume()

[PATCH v2] ice: wait for reset completion in ice_resume()

[Aaron Ma]

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.

Wait for the reset to complete before returning from ice_resume().

Fixes: 769c500dcc1e ("ice: Add advanced power mgmt for WoL")
Cc: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
---
v2: reword comment to clarify best-effort semantics (Kohei Enju)

 drivers/net/ethernet/intel/ice/ice_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 5f92377d4dfc2..a81eb21ea87c1 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -5635,6 +5635,15 @@ 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, 10 * HZ);
+	if (ret)
+		dev_err(dev, "Wait for reset failed during resume: %d\n", ret);
+
 	return 0;
 }
 
-- 
2.43.0