linux-kernel - [GIT PULL 01/26] lightnvm: pblk: line reference fix in GC

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Message-Id: <20190504183811.18725-2-mb@lightnvm.io>
Date:   Sat,  4 May 2019 20:37:46 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     axboe@...com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Igor Konopko <igor.j.konopko@...el.com>,
        Matias Bjørling <mb@...htnvm.io>
Subject: [GIT PULL 01/26] lightnvm: pblk: line reference fix in GC

From: Igor Konopko <igor.j.konopko@...el.com>

Fixes the GC error case when moving a line back to closed state
while releasing additional references.

Signed-off-by: Igor Konopko <igor.j.konopko@...el.com>
Reviewed-by: Hans Holmberg <hans.holmberg@...xlabs.com>
Reviewed-by: Javier González <javier@...igon.com>
Signed-off-by: Matias Bjørling <mb@...htnvm.io>
---
 drivers/lightnvm/pblk-gc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
index 26a52ea7ec45..901e49951ab5 100644
--- a/drivers/lightnvm/pblk-gc.c
+++ b/drivers/lightnvm/pblk-gc.c
@@ -290,8 +290,11 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
 fail_free_ws:
 	kfree(line_ws);
 
+	/* Line goes back to closed state, so we cannot release additional
+	 * reference for line, since we do that only when we want to do
+	 * gc to free line state transition.
+	 */
 	pblk_put_line_back(pblk, line);
-	kref_put(&line->ref, pblk_line_put);
 	atomic_dec(&gc->read_inflight_gc);
 
 	pblk_err(pblk, "failed to GC line %d\n", line->id);
-- 
2.19.1