Currently in case of error returned by pblk_gc_line
to pblk_gc_read we leave current line unassigned
from all the lists. This patch fixes that issue.

Signed-off-by: Igor Konopko <redacted>
---
  drivers/lightnvm/pblk-gc.c | 7 ++++++-
  1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
index 511ed0d5333c..533da6ea3e15 100644
--- a/drivers/lightnvm/pblk-gc.c
+++ b/drivers/lightnvm/pblk-gc.c

@@ -361,8 +361,13 @@ static int pblk_gc_read(struct pblk *pblk)
  
  	pblk_gc_kick(pblk);
  
-	if (pblk_gc_line(pblk, line))
+	if (pblk_gc_line(pblk, line)) {
  		pblk_err(pblk, "failed to GC line %d\n", line->id);
+		/* rollback */
+		spin_lock(&gc->r_lock);
+		list_add_tail(&line->list, &gc->r_list);
+		spin_unlock(&gc->r_lock);
+	}
  
  	return 0;
  }