KVM: MMU: fix missing percpu counter destroy

commit ad05c88266b4cce1c820928ce8a0fb7690912ba1
(KVM: create aggregate kvm_total_used_mmu_pages value)
introduce percpu counter kvm_total_used_mmu_pages but never
destroy it, this may cause oops when rmmod & modprobe.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Tim Pepper <lnxninja@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c2ac7004441a..54a50268cebf 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3185,6 +3185,7 @@ static void mmu_destroy_caches(void)
 void kvm_mmu_module_exit(void)
 {
         mmu_destroy_caches();
+        percpu_counter_destroy(&kvm_total_used_mmu_pages);
         unregister_shrinker(&mmu_shrinker);
 }
 
@@ -3207,7 +3208,9 @@ int kvm_mmu_module_init(void)
         if (!mmu_page_header_cache)
                 goto nomem;
 
-        percpu_counter_init(&kvm_total_used_mmu_pages, 0);
+        if (percpu_counter_init(&kvm_total_used_mmu_pages, 0))
+                goto nomem;
+
         register_shrinker(&mmu_shrinker);
 
         return 0;