[PATCH 05/10] UBI: fix ubi free PEBs count calculation

[Sascha Hauer]

From: Tanya Brokhman <tlinder at codeaurora.org>

The ubi->free_count should be updated with every insert/remove to/from
the ubi->free list.

Signed-off-by: Tanya Brokhman <tlinder at codeaurora.org>
Reviewed-by: Dolev Raviv <draviv at codeaurora.org>
Acked-by: Richard Weinberger <richard at nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
---
 drivers/mtd/ubi/wl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 4ecbe18..e52910f 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -635,6 +635,8 @@ static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
 
 	e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
 	self_check_in_wl_tree(ubi, e, &ubi->free);
+	ubi->free_count--;
+	ubi_assert(ubi->free_count >= 0);
 	rb_erase(&e->u.rb, &ubi->free);
 
 	return e;
@@ -1018,6 +1020,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
 
 			/* Give the unused PEB back */
 			wl_tree_add(e2, &ubi->free);
+			ubi->free_count++;
 			goto out_cancel;
 		}
 		self_check_in_wl_tree(ubi, e1, &ubi->used);
-- 
2.1.0