[Patch Part1 V2 03/20] iommu/vt-d: fix a race window in allocating domain ID for virtual machines

2013-12-05 Thread Jiang Liu 
Function intel_iommu_domain_init() may be concurrently called by upper
layer without serialization, so use atomic_t to protect domain id
allocation.

Signed-off-by: Jiang Liu 
---
 drivers/iommu/intel-iommu.c |4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 43b9bfe..b8e3b48 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3877,7 +3877,7 @@ static void vm_domain_remove_all_dev_info(struct 
dmar_domain *domain)
 }
 
 /* domain id for virtual machine, it won't be set in context */
-static unsigned long vm_domid;
+static atomic_t vm_domid = ATOMIC_INIT(0);
 
 static struct dmar_domain *iommu_alloc_vm_domain(void)
 {
@@ -3887,7 +3887,7 @@ static struct dmar_domain *iommu_alloc_vm_domain(void)
if (!domain)
return NULL;
 
-   domain->id = vm_domid++;
+   domain->id = atomic_inc_return(_domid);
domain->nid = -1;
memset(domain->iommu_bmp, 0, sizeof(domain->iommu_bmp));
domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
-- 
1.7.10.4

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[Patch Part1 V2 03/20] iommu/vt-d: fix a race window in allocating domain ID for virtual machines

2013-12-05 Thread Jiang Liu 
Function intel_iommu_domain_init() may be concurrently called by upper
layer without serialization, so use atomic_t to protect domain id
allocation.

Signed-off-by: Jiang Liu jiang@linux.intel.com
---
 drivers/iommu/intel-iommu.c |4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 43b9bfe..b8e3b48 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3877,7 +3877,7 @@ static void vm_domain_remove_all_dev_info(struct 
dmar_domain *domain)
 }
 
 /* domain id for virtual machine, it won't be set in context */
-static unsigned long vm_domid;
+static atomic_t vm_domid = ATOMIC_INIT(0);
 
 static struct dmar_domain *iommu_alloc_vm_domain(void)
 {
@@ -3887,7 +3887,7 @@ static struct dmar_domain *iommu_alloc_vm_domain(void)
if (!domain)
return NULL;
 
-   domain-id = vm_domid++;
+   domain-id = atomic_inc_return(vm_domid);
domain-nid = -1;
memset(domain-iommu_bmp, 0, sizeof(domain-iommu_bmp));
domain-flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
-- 
1.7.10.4

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