[PATCH 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy()

[Sean Christopherson]

Move the putting of vcpu->pid to kvm_vcpu_destroy().  vcpu->pid is
guaranteed to be NULL when kvm_vcpu_uninit() is called in the error
path of kvm_vm_ioctl_create_vcpu(), e.g. it is explicit nullified by
kvm_vcpu_init() and is only changed by KVM_RUN.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
 virt/kvm/kvm_main.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b1f4ee9c2c76..c079b22032fa 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -318,12 +318,6 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 
 static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
-	/*
-	 * no need for rcu_read_lock as VCPU_RUN is the only place that
-	 * will change the vcpu->pid pointer and on uninit all file
-	 * descriptors are already gone.
-	 */
-	put_pid(rcu_dereference_protected(vcpu->pid, 1));
 	free_page((unsigned long)vcpu->run);
 }
 
@@ -331,6 +325,13 @@ void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kvm_arch_vcpu_destroy(vcpu);
 
+	/*
+	 * No need for rcu_read_lock as VCPU_RUN is the only place that changes
+	 * the vcpu->pid pointer, and at destruction time all file descriptors
+	 * are already gone.
+	 */
+	put_pid(rcu_dereference_protected(vcpu->pid, 1));
+
 	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
-- 
2.22.0