KVM: PPC: Book3S HV: Free allocated memory if module init fails

The module's exit function is not called when the init fails, we need
to do cleanup before returning.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220125155735.1018683-4-farosas@linux.ibm.com

Author: farosas

arch/powerpc/kvm/book3s_hv.c

@@ -6096,7 +6096,7 @@ static int kvmppc_book3s_init_hv(void)
 	if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
 		r = kvm_init_subcore_bitmap();
 		if (r)
-			return r;
+			goto err;
 	}
 
 	/*
@@ -6112,7 +6112,8 @@ static int kvmppc_book3s_init_hv(void)
 		np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
 		if (!np) {
 			pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
-			return -ENODEV;
+			r = -ENODEV;
+			goto err;
 		}
 		/* presence of intc confirmed - node can be dropped again */
 		of_node_put(np);
@@ -6125,12 +6126,12 @@ static int kvmppc_book3s_init_hv(void)
 
 	r = kvmppc_mmu_hv_init();
 	if (r)
-		return r;
+		goto err;
 
 	if (kvmppc_radix_possible()) {
 		r = kvmppc_radix_init();
 		if (r)
-			return r;
+			goto err;
 	}
 
 	r = kvmppc_uvmem_init();
@@ -6143,6 +6144,12 @@ static int kvmppc_book3s_init_hv(void)
 	kvmppc_hv_ops = &kvm_ops_hv;
 
 	return 0;
+
+err:
+	kvmhv_nested_exit();
+	kvmppc_radix_exit();
+
+	return r;
 }
 
 static void kvmppc_book3s_exit_hv(void)