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-rw-r--r--drivers/android/binder_alloc.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 195f120c4e8c..bb929eb87116 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -931,8 +931,8 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
mm = alloc->vma_vm_mm;
if (!mmget_not_zero(mm))
goto err_mmget;
- if (!down_write_trylock(&mm->mmap_sem))
- goto err_down_write_mmap_sem_failed;
+ if (!down_read_trylock(&mm->mmap_sem))
+ goto err_down_read_mmap_sem_failed;
vma = binder_alloc_get_vma(alloc);
list_lru_isolate(lru, item);
@@ -945,7 +945,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
trace_binder_unmap_user_end(alloc, index);
}
- up_write(&mm->mmap_sem);
+ up_read(&mm->mmap_sem);
mmput(mm);
trace_binder_unmap_kernel_start(alloc, index);
@@ -959,7 +959,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
mutex_unlock(&alloc->mutex);
return LRU_REMOVED_RETRY;
-err_down_write_mmap_sem_failed:
+err_down_read_mmap_sem_failed:
mmput_async(mm);
err_mmget:
err_page_already_freed: