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iommu/amd: Introduce protection_domain_init() function 

This function contains the common parts between the
initialization of dma_ops_domains and usual protection
domains. This also fixes a long-standing bug which was
uncovered by recent changes, in which the api_lock was not
initialized for dma_ops_domains.

Reported-by: George Wang <xuw2015@gmail.com>
Tested-by: George Wang <xuw2015@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-06-30 08:56:11 +02:00
parent a6e08fb2d2
commit 7a5a566eab
1 changed files with 16 additions and 10 deletions
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26
drivers/iommu/amd_iommu.c
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@ -116,6 +116,7 @@ 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);
/****************************************************************************
*
@ -1880,12 +1881,9 @@ 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;
@ -2915,6 +2913,18 @@ 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;
@ -2923,12 +2933,8 @@ 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);