Free section usage memory in case populate_section_memmap failed.
We use map_count to track the remain unused memory to be freed.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
ChangeLog:
v1->v2:
  * using goto + lable according to Mike's suggestion
---
  mm/sparse.c | 11 +++++++----
  1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 7ac481353b6b..408b737e168e 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c

@@ -533,7 +533,7 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
  			mem_section_usage_size() * map_count);
  	if (!usage) {
  		pr_err("%s: node[%d] usemap allocation failed", __func__, nid);
-		goto failed;
+		goto failed1;
  	}
  	sparse_buffer_init(map_count * section_map_size(), nid);
  	for_each_present_section_nr(pnum_begin, pnum) {

@@ -548,17 +548,20 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
  			pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.",
  			       __func__, nid);
  			pnum_begin = pnum;
-			sparse_buffer_fini();
-			goto failed;
+			goto failed2;
  		}
  		check_usemap_section_nr(nid, usage);
  		sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage,
  				SECTION_IS_EARLY);
  		usage = (void *) usage + mem_section_usage_size();
+		map_count--;
  	}
  	sparse_buffer_fini();
  	return;
-failed:
+failed2:
+	sparse_buffer_fini();
+	memblock_free_early(__pa(usage), map_count * mem_section_usage_size());
+failed1:
  	/* We failed to allocate, mark all the following pnums as not present */
  	for_each_present_section_nr(pnum_begin, pnum) {
  		struct mem_section *ms;