linux-kernel - [PATCH] lightnvm: pblk: ensure right bad block calculation

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Date:   Fri, 15 Sep 2017 14:35:53 +0200
From:   "Javier González" <jg@...htnvm.io>
To:     linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: [PATCH] lightnvm: pblk: ensure right bad block calculation

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@...xlabs.com>
---
 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 9d9adcf3e141..7cf4b536d899 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -707,7 +707,7 @@ static int pblk_lines_init(struct pblk *pblk)
 		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)
-- 
2.7.4