Re: [Intel-wired-lan] [PATCH iwl-next v4 3/5] ice: migrate to netdev ops lock

[Kohei Enju <kohei@enjuk.jp>]

On 03/24 17:56, Alexander Lobakin wrote:
> From: Kohei Enju <kohei@enjuk.jp>
> Date: Thu, 19 Mar 2026 03:56:19 +0900
> 
> > On 03/19 02:55, Kohei Enju wrote:
> >> On 03/18 17:35, Alexander Lobakin wrote:
> >>> Queue management ops unconditionally enable netdev locking. The same
> >>> lock is taken by default by several NAPI configuration functions,
> >>> such as napi_enable() and netif_napi_set_irq().
> >>> Request ops locking in advance and make sure we use the _locked
> >>> counterparts of those functions to avoid deadlocks, taking the lock
> >>> manually where needed (suspend/resume, queue rebuild and resets).
> >>
> >> Hi Alexander,
> 
> 
> Uff, sorry, I didn't notice this thread for some reason. Maybe it landed
> into the IWL folder in my mail client and I haven't checked it for some
> time... But I read LKML online on a daily basis and missed this reports =\

NP, thanks for taking a look!

Regards,
Kohei

> 
> >> After applying this patch (3/5) along with the preceding ones on top of
> >> net-next, I got some WARNING splats when changing the admin state
> >> (up/down) using the ip link command. [1, 2]
> >>
> >> Since I haven't looked into this series in detail, I'm reporting the
> >> splats anyway. 
> >> I'm wondering why I haven't seen anyone report this type of issue up to
> >> v3. Maybe there is something wrong with my setup or devices?
> >>
> >> Device: Intel Corporation Ethernet Controller E810-XXV for SFP (rev 02)
> > 
> > Ah, I think I figured out the reason. My adapter accidentally fell into
> > safe mode. When the adapter is in the safe mode, netdev->queue_mgmt_ops
> > == NULL and netdev->request_ops_lock == false, so
> > netdev_assert_locked_or_invisible() complains about not holding the
> > netdev lock.
> > 
> > Setting netdev->request_ops_lock = true in the safe mode path also
> > worked fine for me.
> > 
> > ---
> > diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> > index 9ef258d5ab48..3477c53316ba 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_main.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> > @@ -3519,6 +3519,7 @@ static void ice_set_ops(struct ice_vsi *vsi)
> > 
> >         if (ice_is_safe_mode(pf)) {
> >                 netdev->netdev_ops = &ice_netdev_safe_mode_ops;
> > +               netdev->request_ops_lock = true;
> 
> This fix looks good to me, thanks!
> 
> >                 ice_set_ethtool_safe_mode_ops(netdev);
> >                 return;
> >         }
> 
> Tony, could you please pick it up to patch 3/5 when sending a new PR?
> 
> Thanks,
> Olek