From: =?UTF-8?q?Javier=20Gonz=C3=A1lez?= <jg@lightnvm.io>
Date: Fri, 30 Jun 2017 17:56:41 +0200
Subject: [PATCH] lightnvm: pblk: add initialization check
Git-commit: b5e063a2861a3af00fe3770e5fb85f936facbf42
Patch-mainline: v4.13-rc1
References: bsc#1104967,FATE#325924
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Add a sanity check to the pblk initialization sequence in order to
ensure that enough LUNs have been allocated to store the line metadata.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/lightnvm/pblk-init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 025d8fe52154..1b0f61233c21 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -716,6 +716,12 @@ static int pblk_lines_init(struct pblk *pblk)
 	lm->emeta_bb = geo->nr_luns - i;
 	lm->min_blk_line = 1 + DIV_ROUND_UP(lm->smeta_sec + lm->emeta_sec[0],
 							geo->sec_per_blk);
+	if (lm->min_blk_line > lm->blk_per_line) {
+		pr_err("pblk: config. not supported. Min. LUN in line:%d\n",
+							lm->blk_per_line);
+		ret = -EINVAL;
+		goto fail;
+	}
 
 	ret = pblk_lines_alloc_metadata(pblk);
 	if (ret)
-- 
2.12.3