linux-kernel - Re: [PATCH next] iommu: intel: don't dereference iommu_device if IOMMU

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Message-ID: <CAMRc=MdLXaPNUwbUPGJS1AY0pq5je9zsGM7eHShLT=f6mT5Dww@mail.gmail.com>
Date:   Wed, 14 Oct 2020 09:18:56 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH next] iommu: intel: don't dereference iommu_device if
 IOMMU_API is not built

On Wed, Oct 14, 2020 at 2:49 AM Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>
> On 10/13/20 3:30 PM, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Since commit c40aaaac1018 ("iommu/vt-d: Gracefully handle DMAR units
> > with no supported address widths") dmar.c needs struct iommu_device to
> > be selected. We can drop this dependency by not dereferencing struct
> > iommu_device if IOMMU_API is not selected and by reusing the information
> > stored in iommu->drhd->ignored instead.
> >
> > This fixes the following build error when IOMMU_API is not selected:
> >
> > drivers/iommu/intel/dmar.c: In function ‘free_iommu’:
> > drivers/iommu/intel/dmar.c:1139:41: error: ‘struct iommu_device’ has no member named ‘ops’
> >   1139 |  if (intel_iommu_enabled && iommu->iommu.ops) {
> >                                                  ^
> >
> > Fixes: c40aaaac1018 ("iommu/vt-d: Gracefully handle DMAR units with no supported address widths")
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> With commit title adjusted to "iommu/vt-d: Don't dereference
> iommu_device if IOMMU_API is not built",
>
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
>

Do you want me to resend it again with a changed title or can you fix
it up when applying? Or should someone else pick it up?

Bartosz