f2fs: mark gc_thread as NULL when thread creation is failed

When gc thread creation is failed, mark gc_thread as NULL to avoid
crash while trying to stop invalid thread in stop_gc_thread->kthread_stop.
Instead make it return from:
	if (!gc_th)
       return;

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index b1e498503e59..16fdec355201 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -104,6 +104,7 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
                         "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
         if (IS_ERR(gc_th->f2fs_gc_task)) {
                 kfree(gc_th);
+                sbi->gc_thread = NULL;
                 return -ENOMEM;
         }
         return 0;