6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Gunthorpe <jgg@xxxxxxxxxx> [ Upstream commit 02bcd1a8b991c6fc29271fa02250bea1b61fb742 ] This is no longer possible, amd_iommu_domain_alloc_paging_flags() is never called with dev = NULL from the core code. Similarly get_amd_iommu_from_dev() can never be NULL either. Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Link: https://lore.kernel.org/r/3-v2-9776c53c2966+1c7-amd_paging_flags_jgg@xxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Stable-dep-of: 082f1bcae8d1 ("iommu/amd: Fully decode all combinations of alloc_paging_flags") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/iommu/amd/iommu.c | 30 ++++++++++-------------------- 1 file changed, 10 insertions(+), 20 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 96d87406f8946..12c416abdce7d 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2344,13 +2344,10 @@ static struct iommu_domain *do_iommu_domain_alloc(unsigned int type, u32 flags, int pgtable) { bool dirty_tracking = flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING; + struct amd_iommu *iommu = get_amd_iommu_from_dev(dev); struct protection_domain *domain; - struct amd_iommu *iommu = NULL; int ret; - if (dev) - iommu = get_amd_iommu_from_dev(dev); - /* * Since DTE[Mode]=0 is prohibited on SNP-enabled system, * default to use IOMMU_DOMAIN_DMA[_FQ]. @@ -2358,8 +2355,7 @@ static struct iommu_domain *do_iommu_domain_alloc(unsigned int type, if (amd_iommu_snp_en && (type == IOMMU_DOMAIN_IDENTITY)) return ERR_PTR(-EINVAL); - domain = protection_domain_alloc(type, - dev ? dev_to_node(dev) : NUMA_NO_NODE); + domain = protection_domain_alloc(type, dev_to_node(dev)); if (!domain) return ERR_PTR(-ENOMEM); @@ -2375,13 +2371,11 @@ static struct iommu_domain *do_iommu_domain_alloc(unsigned int type, domain->domain.geometry.force_aperture = true; domain->domain.pgsize_bitmap = domain->iop.pgtbl.cfg.pgsize_bitmap; - if (iommu) { - domain->domain.type = type; - domain->domain.ops = iommu->iommu.ops->default_domain_ops; + domain->domain.type = type; + domain->domain.ops = iommu->iommu.ops->default_domain_ops; - if (dirty_tracking) - domain->domain.dirty_ops = &amd_dirty_ops; - } + if (dirty_tracking) + domain->domain.dirty_ops = &amd_dirty_ops; return &domain->domain; } @@ -2392,13 +2386,10 @@ amd_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags, { unsigned int type = IOMMU_DOMAIN_UNMANAGED; - struct amd_iommu *iommu = NULL; + struct amd_iommu *iommu = get_amd_iommu_from_dev(dev); const u32 supported_flags = IOMMU_HWPT_ALLOC_DIRTY_TRACKING | IOMMU_HWPT_ALLOC_PASID; - if (dev) - iommu = get_amd_iommu_from_dev(dev); - if ((flags & ~supported_flags) || user_data) return ERR_PTR(-EOPNOTSUPP); @@ -2412,10 +2403,9 @@ amd_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags, /* Allocate domain with v1 page table for dirty tracking */ if (flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING) { - if (iommu && amd_iommu_hd_support(iommu)) { - return do_iommu_domain_alloc(type, dev, - flags, AMD_IOMMU_V1); - } + if (amd_iommu_hd_support(iommu)) + return do_iommu_domain_alloc(type, dev, flags, + AMD_IOMMU_V1); return ERR_PTR(-EOPNOTSUPP); } -- 2.39.5
