KVM: do not release the error pfn

After commit a2766325cf9f9, the error pfn is replaced by the
error code, it need not be released anymore

[ The patch has been compiling tested for powerpc ]

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 8 insertions, 7 deletions

diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 6a67bea4019..037cb6730e6 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -107,7 +107,6 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
                  */
                 pfn = kvm_pin_pages(slot, gfn, page_size);
                 if (is_error_pfn(pfn)) {
-                        kvm_release_pfn_clean(pfn);
                         gfn += 1;
                         continue;
                 }
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 93d3c6e063c..eafba99d107 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -102,9 +102,6 @@ static bool largepages_enabled = true;
 
 bool kvm_is_mmio_pfn(pfn_t pfn)
 {
-        if (is_error_pfn(pfn))
-                return false;
-
         if (pfn_valid(pfn)) {
                 int reserved;
                 struct page *tail = pfn_to_page(pfn);
@@ -1165,10 +1162,13 @@ EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
 
 static struct page *kvm_pfn_to_page(pfn_t pfn)
 {
-        WARN_ON(kvm_is_mmio_pfn(pfn));
+        if (is_error_pfn(pfn))
+                return KVM_ERR_PTR_BAD_PAGE;
 
-        if (is_error_pfn(pfn) || kvm_is_mmio_pfn(pfn))
+        if (kvm_is_mmio_pfn(pfn)) {
+                WARN_ON(1);
                 return KVM_ERR_PTR_BAD_PAGE;
+        }
 
         return pfn_to_page(pfn);
 }
@@ -1193,7 +1193,9 @@ EXPORT_SYMBOL_GPL(kvm_release_page_clean);
 
 void kvm_release_pfn_clean(pfn_t pfn)
 {
-        if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
+        WARN_ON(is_error_pfn(pfn));
+
+        if (!kvm_is_mmio_pfn(pfn))
                 put_page(pfn_to_page(pfn));
 }
 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);