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iommu/tegra-smmu: Remove PageReserved manipulation

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Remove the unnecessary manipulation of the PageReserved flags in the
Tegra SMMU driver.  None of this is required as the page(s) remain
private to the SMMU driver.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Russell King 2015-07-27 13:29:57 +01:00 committed by Thierry Reding
parent e3c971960f
commit 05a65f06f6
1 changed files with 0 additions and 5 deletions
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5
drivers/iommu/tegra-smmu.c
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@ -293,7 +293,6 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
/* clear PDEs */
pd = page_address(as->pd);
SetPageReserved(as->pd);
for (i = 0; i < SMMU_NUM_PDE; i++)
pd[i] = 0;
@ -311,7 +310,6 @@ static void tegra_smmu_domain_free(struct iommu_domain *domain)
struct tegra_smmu_as *as = to_smmu_as(domain);
/* TODO: free page directory and page tables */
ClearPageReserved(as->pd);
kfree(as);
}
@ -566,8 +564,6 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
as->pts[pde] = page;
SetPageReserved(page);
pd[pde] = SMMU_MK_PDE(dma, SMMU_PDE_ATTR | SMMU_PDE_NEXT);
dma_sync_single_range_for_device(smmu->dev, as->pd_dma,
@ -617,7 +613,6 @@ static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
/* Finally, free the page */
dma_unmap_page(smmu->dev, pte_dma, SMMU_SIZE_PT, DMA_TO_DEVICE);
ClearPageReserved(page);
__free_page(page);
as->pts[pde] = NULL;
}