Subject: FAILED: patch "[PATCH] ice: wait for reset completion in ice_resume()" failed to apply to 5.15-stable tree
To: aaron.ma@canonical.com,aleksandr.loktionov@intel.com,alexander.nowlin@intel.com,anthony.l.nguyen@intel.com,kohei@enjuk.jp,przemyslaw.kitszel@intel.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Wed, 05 Aug 2026 13:50:26 +0200
Message-ID: <2026080526-docile-reply-8f04@gregkh>
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The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x c2816d613f388814d27bc9fd6dbd931a88056e19
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026080526-docile-reply-8f04@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c2816d613f388814d27bc9fd6dbd931a88056e19 Mon Sep 17 00:00:00 2001
From: Aaron Ma <aaron.ma@canonical.com>
Date: Wed, 29 Apr 2026 11:48:49 +0800
Subject: [PATCH] ice: wait for reset completion in ice_resume()

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 <kohei@enjuk.jp>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Tested-by: Alexander Nowlin <alexander.nowlin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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;
 }