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

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Message-ID: <dc6f3226-c6e5-b361-601b-afa91540144e@linux.intel.com>
Date:   Wed, 14 Oct 2020 15:25:08 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     baolu.lu@...ux.intel.com, 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

Hi Bartosz,

On 10/14/20 3:18 PM, Bartosz Golaszewski wrote:
> 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?

I suppose Joerg will pick this up. I guess you don't need to resend it
unless Joerg asks you to do.

Best regards,
baolu