linux-kernel - [PATCH 4.19 132/313] lightnvm: pblk: add lock protection to list operations

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Message-Id: <20190211141902.525901417@linuxfoundation.org>
Date:   Mon, 11 Feb 2019 15:16:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hua Su <suhua.tanke@...il.com>,
        Javier González <javier@...xlabs.com>,
        Matias Bjørling <mb@...htnvm.io>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 132/313] lightnvm: pblk: add lock protection to list operations

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit fde201a466c6ad5efd72cb54fdf2cefa8b6c6ad7 ]

Protect the list_add on the pblk_line_init_bb() error
path in case this code is used for some other purpose
in the future.

Signed-off-by: Hua Su <suhua.tanke@...il.com>
Reviewed-by: Javier González <javier@...xlabs.com>
Signed-off-by: Matias Bjørling <mb@...htnvm.io>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/lightnvm/pblk-core.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 2940cdc87af1..95be6e36c7dd 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -1252,15 +1252,22 @@ int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
 
 	ret = pblk_line_alloc_bitmaps(pblk, line);
 	if (ret)
-		return ret;
+		goto fail;
 
 	if (!pblk_line_init_bb(pblk, line, 0)) {
-		list_add(&line->list, &l_mg->free_list);
-		return -EINTR;
+		ret = -EINTR;
+		goto fail;
 	}
 
 	pblk_rl_free_lines_dec(&pblk->rl, line, true);
 	return 0;
+
+fail:
+	spin_lock(&l_mg->free_lock);
+	list_add(&line->list, &l_mg->free_list);
+	spin_unlock(&l_mg->free_lock);
+
+	return ret;
 }
 
 void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
-- 
2.19.1