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@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

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)