From e6b754c252bacebdfbe3c57e790431ab8f445d1f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Javier=20Gonz=C3=A1lez?= <javier@cnexlabs.com>
Date: Fri, 13 Oct 2017 14:46:27 +0200
Subject: [PATCH] lightnvm: pblk: ensure right bad block calculation
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Make sure that the variable controlling block threshold for allocating
extra metadata sectors in case of a line with bad blocks does not get a
negative value. Otherwise, the line will be marked as corrupted and
wasted.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 drivers/lightnvm/pblk-init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 3c3749186053..c7239c41ba40 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -710,7 +710,7 @@ add_emeta_page:
 		goto add_emeta_page;
 	}
 
-	lm->emeta_bb = geo->nr_luns - i;
+	lm->emeta_bb = geo->nr_luns > i ? geo->nr_luns - i : 0;
 
 	lm->min_blk_line = 1;
 	if (geo->nr_luns > 1)
-- 
2.30.2