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iommu/tegra-smmu: Remove PageReserved manipulation 

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;
}