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Merge tag 'iommu-fixes-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

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Pul IOMMU fixes from Joerg Roedel:
 "Four fixes have queued up to fix regressions introduced after v4.1:

   - Don't fail IOMMU driver initialization when the add_device
     call-back returns -ENODEV, as that just means that the device is
     not translated by the IOMMU.  This is pretty common on ARM.

   - Two fixes for the ARM-SMMU driver for a wrong feature check and to
     remove a redundant NULL check.

   - A fix for the AMD IOMMU driver to fix a boot panic on systems where
     the BIOS requests Unity Mappings in the IVRS table"

* tag 'iommu-fixes-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/amd: Introduce protection_domain_init() function
  iommu/arm-smmu: Delete an unnecessary check before the function call "free_io_pgtable_ops"
  iommu/arm-smmu: Fix broken ATOS check
  iommu: Ignore -ENODEV errors from add_device call-back
This commit is contained in:
Linus Torvalds
2015-07-01 14:44:22 -07:00
parent f822dcc63f 7a5a566eab
commit 44b061f77f
4 changed files with 30 additions and 14 deletions
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26
drivers/iommu/amd_iommu.c
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@@ -117,6 +117,7 @@ struct kmem_cache *amd_iommu_irq_cache;
static void update_domain(struct protection_domain *domain);
static int alloc_passthrough_domain(void);
static int protection_domain_init(struct protection_domain *domain);
/****************************************************************************
*
@@ -1881,12 +1882,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
if (!dma_dom)
return NULL;
spin_lock_init(&dma_dom->domain.lock);
dma_dom->domain.id = domain_id_alloc();
if (dma_dom->domain.id == 0)
if (protection_domain_init(&dma_dom->domain))
goto free_dma_dom;
INIT_LIST_HEAD(&dma_dom->domain.dev_list);
dma_dom->domain.mode = PAGE_MODE_2_LEVEL;
dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
dma_dom->domain.flags = PD_DMA_OPS_MASK;
@@ -2916,6 +2914,18 @@ static void protection_domain_free(struct protection_domain *domain)
kfree(domain);
}
static int protection_domain_init(struct protection_domain *domain)
{
spin_lock_init(&domain->lock);
mutex_init(&domain->api_lock);
domain->id = domain_id_alloc();
if (!domain->id)
return -ENOMEM;
INIT_LIST_HEAD(&domain->dev_list);
return 0;
}
static struct protection_domain *protection_domain_alloc(void)
{
struct protection_domain *domain;
@@ -2924,12 +2934,8 @@ static struct protection_domain *protection_domain_alloc(void)
if (!domain)
return NULL;
spin_lock_init(&domain->lock);
mutex_init(&domain->api_lock);
domain->id = domain_id_alloc();
if (!domain->id)
if (protection_domain_init(domain))
goto out_err;
INIT_LIST_HEAD(&domain->dev_list);
add_domain_to_list(domain);