Why isn't this required?
diff --git a/fs/dax.c b/fs/dax.c
index a7f77e1..30f2abe 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -416,6 +416,7 @@ int __dax_fault(struct vm_area_struct *vma, struct vm_fault
error = -EIO;
goto out;
}
+ i_mmap_unlock_read(mapping);
}
return VM_FAULT_LOCKED;
}
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