[PATCH] iommu: Unexport iommu_fwspec_free()

[Jason Gunthorpe]

On Thu, Feb 27, 2025 at 02:47:47PM +0000, Robin Murphy wrote:
> The drivers doing their own fwspec parsing have no need to call
> iommu_fwspec_free() since fwspecs were moved into dev_iommu, as
> returning an error from .probe_device will tear down the whole lot
> anyway. Move it into the private interface now that it only serves
> for of_iommu to clean up in an error case.
> 
> I have no idea what mtk_v1 was doing in effectively guaranteeing
> a NULL fwspec would be dereferenced if no "iommus" DT property was
> found, so add a check for that to at least make the code look sane.

> Signed-off-by: Robin Murphy <robin.murphy at arm.com>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu.c |  1 -
>  drivers/iommu/iommu-priv.h            |  2 ++
>  drivers/iommu/iommu.c                 |  1 -
>  drivers/iommu/mtk_iommu_v1.c          | 14 ++++----------
>  drivers/iommu/tegra-smmu.c            |  1 -
>  include/linux/iommu.h                 |  5 -----
>  6 files changed, 6 insertions(+), 18 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason