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

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Message-ID: <ae53c46a22b4a064e335e4ca89adcbfa317fc7e6.camel@infradead.org>
Date:   Tue, 13 Oct 2020 10:16:58 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, 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 Tue, 2020-10-13 at 09:30 +0200, 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>

Oops, apologies for that. Thanks for fixing it.

Acked-by: David Woodhouse <dwmw@...zon.co.uk>



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