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iommu/tegra-smmu: Use kcalloc() to allocate counter array 

Use kcalloc() to allocate the use-counter array for the page directory
entries/page tables.  Using kcalloc() allows us to be provided with
zero-initialised memory from the allocators, rather than initialising
it ourselves.

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 13:29:31 +01:00 committed by Thierry Reding
parent 853520fa96
commit 32924c76b0
1 changed files with 6 additions and 15 deletions
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21
drivers/iommu/tegra-smmu.c
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@ -40,7 +40,7 @@ struct tegra_smmu_as {
struct iommu_domain domain;
struct tegra_smmu *smmu;
unsigned int use_count;
struct page *count;
u32 *count;
struct page **pts;
struct page *pd;
unsigned id;
@ -265,7 +265,7 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
return NULL;
}
as->count = alloc_page(GFP_KERNEL);
as->count = kcalloc(SMMU_NUM_PDE, sizeof(u32), GFP_KERNEL);
if (!as->count) {
__free_page(as->pd);
kfree(as);
@ -274,7 +274,7 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
as->pts = kcalloc(SMMU_NUM_PDE, sizeof(*as->pts), GFP_KERNEL);
if (!as->pts) {
__free_page(as->count);
kfree(as->count);
__free_page(as->pd);
kfree(as);
return NULL;
@ -284,13 +284,6 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
pd = page_address(as->pd);
SetPageReserved(as->pd);
for (i = 0; i < SMMU_NUM_PDE; i++)
pd[i] = 0;
/* clear PDE usage counters */
pd = page_address(as->count);
SetPageReserved(as->count);
for (i = 0; i < SMMU_NUM_PDE; i++)
pd[i] = 0;
@ -509,7 +502,7 @@ static u32 *tegra_smmu_pte_lookup(struct tegra_smmu_as *as, unsigned long iova,
static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
struct page **pagep)
{
u32 *pd = page_address(as->pd), *pt, *count;
u32 *pd = page_address(as->pd), *pt;
unsigned int pde = iova_pd_index(iova);
struct tegra_smmu *smmu = as->smmu;
struct page *page;
@ -545,9 +538,8 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
pt = page_address(page);
/* Keep track of entries in this page table. */
count = page_address(as->count);
if (pt[iova_pt_index(iova)] == 0)
count[pde]++;
as->count[pde]++;
return tegra_smmu_pte_offset(page, iova);
}
@ -556,7 +548,6 @@ static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
{
struct tegra_smmu *smmu = as->smmu;
unsigned int pde = iova_pd_index(iova);
u32 *count = page_address(as->count);
u32 *pd = page_address(as->pd);
struct page *page = as->pts[pde];
@ -564,7 +555,7 @@ static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
* When no entries in this page table are used anymore, return the
* memory page to the system.
*/
if (--count[pde] == 0) {
if (--as->count[pde] == 0) {
unsigned int offset = pde * sizeof(*pd);
/* Clear the page directory entry first */