[PATCH 01/13] lightnvm: pblk: Line reference fix in GC

Igor Konopko
2019-02-27T17:17:42Z

This patch fixes the error case in GC when
we both moves line back to closed state and
release additional reference, what cause illegal
transition from closed to free on pblk_line_put
when only gc to free line state transition is
allowed using that path.

Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
---
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 2fa118c8eb71..3feadfd9418d 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);
--
2.17.1