1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 8fe165844e47..064f5e31ec55 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -913,6 +913,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
 	struct binder_alloc *alloc;
 	uintptr_t page_addr;
 	size_t index;
+	struct vm_area_struct *vma;
 
 	alloc = page->alloc;
 	if (!mutex_trylock(&alloc->mutex))
@@ -923,16 +924,22 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
 
 	index = page - alloc->pages;
 	page_addr = (uintptr_t)alloc->buffer + index * PAGE_SIZE;
-	if (alloc->vma) {
+	vma = alloc->vma;
+	if (vma) {
 		mm = get_task_mm(alloc->tsk);
 		if (!mm)
 			goto err_get_task_mm_failed;
 		if (!down_write_trylock(&mm->mmap_sem))
 			goto err_down_write_mmap_sem_failed;
+	}
+
+	list_lru_isolate(lru, item);
+	spin_unlock(lock);
 
+	if (vma) {
 		trace_binder_unmap_user_start(alloc, index);
 
-		zap_page_range(alloc->vma,
+		zap_page_range(vma,
 			       page_addr + alloc->user_buffer_offset,
 			       PAGE_SIZE);
 
@@ -950,13 +957,12 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
 
 	trace_binder_unmap_kernel_end(alloc, index);
 
-	list_lru_isolate(lru, item);
-
+	spin_lock(lock);
 	mutex_unlock(&alloc->mutex);
-	return LRU_REMOVED;
+	return LRU_REMOVED_RETRY;
 
 err_down_write_mmap_sem_failed:
-	mmput(mm);
+	mmput_async(mm);
 err_get_task_mm_failed:
 err_page_already_freed:
 	mutex_unlock(&alloc->mutex);