RE: [PATCH 1/1] i40e: Avoid double IRQ free on error path in probe()

[PJ Waskiewicz <pwaskiewicz@jumptrading.com>]

> -----Original Message-----
> From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> Sent: Thursday, August 26, 2021 1:04 AM
> To: PJ Waskiewicz <pwaskiewicz@jumptrading.com>
> Cc: David S . Miller <davem@davemloft.net>; Jesse Brandeburg
> <jesse.brandeburg@intel.com>; netdev@vger.kernel.org; intel-wired-
> lan@lists.osuosl.org; PJ Waskiewicz <pjwaskiewicz@gmail.com>
> Subject: Re: [PATCH 1/1] i40e: Avoid double IRQ free on error path in probe()
>
> This message has originated from an EXTERNAL SENDER
>
> On Wed, Aug 25, 2021 at 02:23:21PM -0500, PJ Waskiewicz wrote:
> > This fixes an error path condition when probe() fails due to the
> > default VSI not being available or online yet in the firmware. If that
> > happens, the previous teardown path would clear the interrupt scheme,
> > which also freed the IRQs with the OS. Then the error path for the
> > switch setup (pre-VSI) would attempt to free the OS IRQs as well.
>
> Nice to hear from you PJ.
> Looks like a 'net' candidate, so we need a Fixes: tag.

Likewise, nice to be submitting patches again.

I'll respin and send to net.

> Also, you probably should send it to iwl with cc to netdev and Tony will pick
> and combine it into his pull request.

Roger that, I'll rearrange the To: and Cc: members.

> Patch LGTM.
> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

Thanks.

[...snip...]

> > @@ -4865,7 +4865,8 @@ static void i40e_reset_interrupt_capability(struct
> i40e_pf *pf)
> >   * @pf: board private structure
> >   *
> >   * We go through and clear interrupt specific resources and reset the
> > structure
> > - * to pre-load conditions
> > + * to pre-load conditions.  OS interrupt teardown must be done
> > + separately due
> > + * to VSI vs. PF instantiation, and different teardown path requirements.
>
> Small nit: no need for a dot in 'vs.' ?

Apparently this is different between British English and American English (no dot in the former).  Who would have thought...I'll update and drop the '.'.

> >   **/
> >  static void i40e_clear_interrupt_scheme(struct i40e_pf *pf)  { @@
> > -4880,7 +4881,6 @@ static void i40e_clear_interrupt_scheme(struct
> i40e_pf *pf)
> >         for (i = 0; i < pf->num_alloc_vsi; i++)
> >                 if (pf->vsi[i])
> >                         i40e_vsi_free_q_vectors(pf->vsi[i]);
> > -       i40e_reset_interrupt_capability(pf);
> >  }
> >
> >  /**
> > @@ -10526,6 +10526,7 @@ static void i40e_rebuild(struct i40e_pf *pf, bool
> reinit, bool lock_acquired)
> >                          */
> >                         free_irq(pf->pdev->irq, pf);
> >                         i40e_clear_interrupt_scheme(pf);
> > +                       i40e_reset_interrupt_capability(pf);
> >                         if (i40e_restore_interrupt_scheme(pf))
> >                                 goto end_unlock;
> >                 }
> > @@ -15928,6 +15929,7 @@ static void i40e_remove(struct pci_dev *pdev)
> >         /* Clear all dynamic memory lists of rings, q_vectors, and VSIs */
> >         rtnl_lock();
> >         i40e_clear_interrupt_scheme(pf);
> > +       i40e_reset_interrupt_capability(pf);
> >         for (i = 0; i < pf->num_alloc_vsi; i++) {
> >                 if (pf->vsi[i]) {
> >                         if (!test_bit(__I40E_RECOVERY_MODE,
> > pf->state)) @@ -16150,6 +16152,7 @@ static void i40e_shutdown(struct
> pci_dev *pdev)
> >          */
> >         rtnl_lock();
> >         i40e_clear_interrupt_scheme(pf);
> > +       i40e_reset_interrupt_capability(pf);
> >         rtnl_unlock();
> >
> >         if (system_state == SYSTEM_POWER_OFF) { @@ -16202,6 +16205,7
> > @@ static int __maybe_unused i40e_suspend(struct device *dev)
> >          * to CPU0.
> >          */
> >         i40e_clear_interrupt_scheme(pf);
> > +       i40e_reset_interrupt_capability(pf);
> >
> >         rtnl_unlock();
> >
> > --
> > 2.27.0
> >
> >
>
> And probably talk to your IT dep to get rid of the footer :P

I know, that is something I've been working on.  Not sure I have much control over that unfortunately.

-PJ

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