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authorJoerg Roedel <jroedel@suse.de>2015-06-30 09:56:11 +0300
committerJoerg Roedel <jroedel@suse.de>2015-07-01 09:43:07 +0300
commit7a5a566eab48da7522f601f96aef3af102178046 (patch)
tree04aa5c7a5d77036e8a83f52a7b3585772627ca75 /drivers/iommu
parenta6e08fb2d2f9eb38f52e6f2425a38f1cb9794742 (diff)
downloadlinux-7a5a566eab48da7522f601f96aef3af102178046.tar.xz
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index c5677ed2cd89..cedbf004c8ef 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -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);