diff options
| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-01-06 14:18:10 +0800 |
|---|---|---|
| committer | Joerg Roedel <joro@8bytes.org> | 2014-01-09 12:43:24 +0100 |
| commit | 18d99165d3ebe5e365de57bcc673901d754c7142 (patch) | |
| tree | 9729b26cae46a1ebf2c66cdd8de7418beb4948c3 | |
| parent | ada4d4b2a32e9f63d4dcb9f69578473408f4622c (diff) | |
| download | linux-18d99165d3ebe5e365de57bcc673901d754c7142.tar.gz linux-18d99165d3ebe5e365de57bcc673901d754c7142.tar.bz2 linux-18d99165d3ebe5e365de57bcc673901d754c7142.zip | |
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>
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 4 |
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; |