iommu/amd: Allow NULL pointer parameter for domain_flush_complete()

If domain == NULL is passed to the function, it will queue a
completion-wait command on all IOMMUs in the system.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 38f8a5e..0884b12 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1177,7 +1177,7 @@ static void domain_flush_complete(struct protection_domain *domain)
        int i;
 
        for (i = 0; i < amd_iommus_present; ++i) {
-               if (!domain->dev_iommu[i])
+               if (domain && !domain->dev_iommu[i])
                        continue;
 
                /*