--- 2.4.7pre3aa1/mm/memory.c.~1~	Fri Jul  6 18:39:31 2001
+++ 2.4.7pre3aa1/mm/memory.c	Fri Jul  6 18:56:42 2001
@@ -460,7 +460,7 @@
 	if (err)
 		return err;
 
-	down_write(&mm->mmap_sem);
+	down_read(&mm->mmap_sem);
 
 	err = -EFAULT;
 	iobuf->locked = 0;
@@ -519,12 +519,12 @@
 		ptr += PAGE_SIZE;
 	}
 
-	up_write(&mm->mmap_sem);
+	up_read(&mm->mmap_sem);
 	dprintk ("map_user_kiobuf: end OK\n");
 	return 0;
 
  out_unlock:
-	up_write(&mm->mmap_sem);
+	up_read(&mm->mmap_sem);
 	unmap_kiobuf(iobuf);
 	dprintk ("map_user_kiobuf: end %d\n", err);
 	return err;