diff --git a/[refs] b/[refs]
index f2bf2a5a431e..d505612c76ab 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 52435b7c7a29f7dd7947c8c204494d7f52f14813
+refs/heads/master: 905fa4b9d6e2c9fd1c9ad84e3abe83021f498f53
diff --git a/trunk/arch/powerpc/kvm/44x_tlb.c b/trunk/arch/powerpc/kvm/44x_tlb.c
index aa649c7db99b..1c48d6164bd5 100644
--- a/trunk/arch/powerpc/kvm/44x_tlb.c
+++ b/trunk/arch/powerpc/kvm/44x_tlb.c
@@ -142,18 +142,19 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid,
 	stlbe = &vcpu->arch.shadow_tlb[victim];
 
 	/* Get reference to new page. */
-	down_write(&current->mm->mmap_sem);
+	down_read(&current->mm->mmap_sem);
 	new_page = gfn_to_page(vcpu->kvm, gfn);
 	if (is_error_page(new_page)) {
 		printk(KERN_ERR "Couldn't get guest page!\n");
 		kvm_release_page_clean(new_page);
+		up_read(&current->mm->mmap_sem);
 		return;
 	}
 	hpaddr = page_to_phys(new_page);
 
 	/* Drop reference to old page. */
 	kvmppc_44x_shadow_release(vcpu, victim);
-	up_write(&current->mm->mmap_sem);
+	up_read(&current->mm->mmap_sem);
 
 	vcpu->arch.shadow_pages[victim] = new_page;