linux-kernel - Re: [PATCH v3] iommu: Check dev->iommu in iommu_dev

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Date:   Thu, 18 Mar 2021 10:48:28 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        robin.murphy@....com, jean-philippe@...aro.org, will@...nel.org,
        prime.zeng@...ilicon.com, linuxarm@...neuler.org
Subject: Re: [PATCH v3] iommu: Check dev->iommu in iommu_dev_xxx functions

On Wed, Mar 03, 2021 at 05:36:11PM +0000, Shameer Kolothum wrote:
> The device iommu probe/attach might have failed leaving dev->iommu
> to NULL and device drivers may still invoke these functions resulting
> in a crash in iommu vendor driver code.
> 
> Hence make sure we check that.
> 
> Fixes: a3a195929d40 ("iommu: Add APIs for multiple domains per device")
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> ---
> v2 --> v3
>  -Removed iommu_ops from struct dev_iommu.
> v1 --> v2:
>  -Added iommu_ops to struct dev_iommu based on the discussion with Robin.
>  -Rebased against iommu-tree core branch.
> ---
>  drivers/iommu/iommu.c | 24 +++++++++++++++---------
>  1 file changed, 15 insertions(+), 9 deletions(-)

Applied, thanks.