linux-kernel - Re: [PATCH] f2fs: remove redundant return in f2fs_create_flush_cmd

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Date:   Tue, 25 Oct 2022 15:29:06 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: remove redundant return in
 f2fs_create_flush_cmd_control()

On 2022/10/25 15:08, Yangtao Li wrote:
> Hi Chao,
> 
> In my point of view, it should not return 0. Because calling kthread_run()
> to create a kernel thread may fails, and err is assigned a value.

I commented on last 'return err' rather than the one in error path...

Maybe:

---
  fs/f2fs/segment.c | 8 ++++----
  1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 81aadfc06c89..25ee8c8cb2cf 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -634,12 +634,12 @@ int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
  {
  	dev_t dev = sbi->sb->s_bdev->bd_dev;
  	struct flush_cmd_control *fcc;
-	int err = 0;
+	int err;

  	if (SM_I(sbi)->fcc_info) {
  		fcc = SM_I(sbi)->fcc_info;
  		if (fcc->f2fs_issue_flush)
-			return err;
+			return 0;
  		goto init_thread;
  	}

@@ -652,7 +652,7 @@ int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
  	init_llist_head(&fcc->issue_list);
  	SM_I(sbi)->fcc_info = fcc;
  	if (!test_opt(sbi, FLUSH_MERGE))
-		return err;
+		return 0;

  init_thread:
  	fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
@@ -664,7 +664,7 @@ int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
  		return err;
  	}

-	return err;
+	return 0;
  }

  void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
-- 
2.25.1



> 
> Thanks,