summaryrefslogtreecommitdiff
path: root/drivers/iommu
diff options
context:
space:
mode:
authorJiang Liu <jiang.liu@linux.intel.com>2014-01-06 14:18:10 +0800
committerJoerg Roedel <joro@8bytes.org>2014-01-09 12:43:24 +0100
commit18d99165d3ebe5e365de57bcc673901d754c7142 (patch)
tree9729b26cae46a1ebf2c66cdd8de7418beb4948c3 /drivers/iommu
parentada4d4b2a32e9f63d4dcb9f69578473408f4622c (diff)
iommu/vt-d: fix a race window in allocating domain ID for virtual machines
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.liu@linux.intel.com> Cc: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 64d8942d6d14..e2d2cb3119b3 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;