The iommu->lock is used to protect the per-IOMMU domain ID resource.
Moving the lock into the ID alloc/free helpers makes the code more
compact. At the same time, the device_domain_lock is irrelevant to
the domain ID resource, remove its assertion as well.
Signed-off-by: Lu Baolu
---
drivers/iommu/intel/iommu.c | 24 +---
1 file changed, 9 insertions(+), 15 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index a81bdddf1091..5681b8ef11f1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1781,16 +1781,13 @@ static struct dmar_domain *alloc_domain(unsigned int
type)
return domain;
}
-/* Must be called with iommu->lock */
static int domain_attach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
unsigned long ndomains;
- int num;
-
- assert_spin_locked(&device_domain_lock);
- assert_spin_locked(&iommu->lock);
+ int num, ret = 0;
+ spin_lock(&iommu->lock);
domain->iommu_refcnt[iommu->seq_id] += 1;
if (domain->iommu_refcnt[iommu->seq_id] == 1) {
ndomains = cap_ndoms(iommu->cap);
@@ -1799,7 +1796,8 @@ static int domain_attach_iommu(struct dmar_domain *domain,
if (num >= ndomains) {
pr_err("%s: No free domain ids\n", iommu->name);
domain->iommu_refcnt[iommu->seq_id] -= 1;
- return -ENOSPC;
+ ret = -ENOSPC;
+ goto out_unlock;
}
set_bit(num, iommu->domain_ids);
@@ -1808,7 +1806,9 @@ static int domain_attach_iommu(struct dmar_domain *domain,
domain_update_iommu_cap(domain);
}
- return 0;
+out_unlock:
+ spin_unlock(&iommu->lock);
+ return ret;
}
static void domain_detach_iommu(struct dmar_domain *domain,
@@ -1816,9 +1816,7 @@ static void domain_detach_iommu(struct dmar_domain
*domain,
{
int num;
- assert_spin_locked(&device_domain_lock);
- assert_spin_locked(&iommu->lock);
-
+ spin_lock(&iommu->lock);
domain->iommu_refcnt[iommu->seq_id] -= 1;
if (domain->iommu_refcnt[iommu->seq_id] == 0) {
num = domain->iommu_did[iommu->seq_id];
@@ -1826,6 +1824,7 @@ static void domain_detach_iommu(struct dmar_domain
*domain,
domain_update_iommu_cap(domain);
domain->iommu_did[iommu->seq_id] = 0;
}
+ spin_unlock(&iommu->lock);
}
static inline int guestwidth_to_adjustwidth(int gaw)
@@ -2477,9 +2476,7 @@ static int domain_add_dev_info(struct dmar_domain
*domain, struct device *dev)
spin_lock_irqsave(&device_domain_lock, flags);
info->domain = domain;
- spin_lock(&iommu->lock);
ret = domain_attach_iommu(domain, iommu);
- spin_unlock(&iommu->lock);
if (ret) {
spin_unlock_irqrestore(&device_domain_lock, flags);
return ret;
@@ -4183,10 +4180,7 @@ static void __dmar_remove_one_dev_info(struct
device_domain_info *info)
}
list_del(&info->link);
-
- spin_lock(&iommu->lock);
domain_detach_iommu(domain, iommu);
- spin_unlock(&iommu->lock);
}
static void dmar_remove_one_dev_info(struct device *dev)
--
2.25.1
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