iommu/amd: Do not detach devices in domain free path

[ Upstream commit 07bbd66 ]

All devices attached to a protection domain must be freed before
calling domain free. Hence do not try to free devices in domain
free path. Continue to throw warning if pdom->dev_list is not empty
so that any potential issues can be fixed.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20241030063556.6104-7-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Stable-dep-of: faad224 ("iommu/amd: Fix clone_alias() to use the original device's devid")
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: hegdevasant

drivers/iommu/amd/iommu.c

@@ -2316,21 +2316,6 @@ static struct iommu_group *amd_iommu_device_group(struct device *dev)
  *
  *****************************************************************************/
 
-static void cleanup_domain(struct protection_domain *domain)
-{
-	struct iommu_dev_data *entry;
-
-	lockdep_assert_held(&domain->lock);
-
-	while (!list_empty(&domain->dev_list)) {
-		entry = list_first_entry(&domain->dev_list,
-					 struct iommu_dev_data, list);
-		BUG_ON(!entry->domain);
-		do_detach(entry);
-	}
-	WARN_ON(!list_empty(&domain->dev_list));
-}
-
 void protection_domain_free(struct protection_domain *domain)
 {
 	WARN_ON(!list_empty(&domain->dev_list));
@@ -2498,16 +2483,7 @@ amd_iommu_domain_alloc_user(struct device *dev, u32 flags,
 
 void amd_iommu_domain_free(struct iommu_domain *dom)
 {
-	struct protection_domain *domain;
-	unsigned long flags;
-
-	domain = to_pdomain(dom);
-
-	spin_lock_irqsave(&domain->lock, flags);
-
-	cleanup_domain(domain);
-
-	spin_unlock_irqrestore(&domain->lock, flags);
+	struct protection_domain *domain = to_pdomain(dom);
 
 	protection_domain_free(domain);
 }