linux-kernel - [PATCH v2 4/8] proc: use seq_open_data() in proc_id_map

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Date:   Sat, 18 Aug 2018 15:24:30 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH v2 4/8] proc: use seq_open_data() in proc_id_map_open()

Simplify the code slightly by using the seq_open_data helper.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
Depends on 1/8 introducing seq_open_data.

fs/proc/base.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index aaffc0c30216..32ed72c44412 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2747,7 +2747,6 @@ static int proc_id_map_open(struct inode *inode, struct file *file,
 {
 	struct user_namespace *ns = NULL;
 	struct task_struct *task;
-	struct seq_file *seq;
 	int ret = -EINVAL;
 
 	task = get_proc_task(inode);
@@ -2758,19 +2757,11 @@ static int proc_id_map_open(struct inode *inode, struct file *file,
 		put_task_struct(task);
 	}
 	if (!ns)
-		goto err;
+		return ret;
 
-	ret = seq_open(file, seq_ops);
+	ret = seq_open_data(file, seq_ops, ns);
 	if (ret)
-		goto err_put_ns;
-
-	seq = file->private_data;
-	seq->private = ns;
-
-	return 0;
-err_put_ns:
-	put_user_ns(ns);
-err:
+		put_user_ns(ns);
 	return ret;
 }
 
-- 
2.16.4