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

[Greg Kroah-Hartman]

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.ta...@gmail.com>
Reviewed-by: Javier González <jav...@cnexlabs.com>
Signed-off-by: Matias Bjørling <m...@lightnvm.io>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.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