mm: revert "mm: shmem: fix data-race in shmem_getattr()"

Revert d949d1d ("mm: shmem: fix data-race in shmem_getattr()") as
suggested by Chuck [1].  It is causing deadlocks when accessing tmpfs over
NFS.

As Hugh commented, "added just to silence a syzbot sanitizer splat: added
where there has never been any practical problem".

Link: https://lkml.kernel.org/r/[email protected] [1]
Fixes: d949d1d ("mm: shmem: fix data-race in shmem_getattr()")
Acked-by: Hugh Dickins <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Jeongjun Park <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: akpm00

mm/shmem.c

@@ -1166,9 +1166,7 @@ static int shmem_getattr(struct mnt_idmap *idmap,
 	stat->attributes_mask |= (STATX_ATTR_APPEND |
 			STATX_ATTR_IMMUTABLE |
 			STATX_ATTR_NODUMP);
-	inode_lock_shared(inode);
 	generic_fillattr(idmap, request_mask, inode, stat);
-	inode_unlock_shared(inode);
 
 	if (shmem_huge_global_enabled(inode, 0, 0, false, NULL, 0))
 		stat->blksize = HPAGE_PMD_SIZE;