linux-kernel - [PATCH] chardev: call tty_init() in real chrdev

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Date:   Mon,  7 Feb 2022 00:27:31 +0800
From:   Xu Yu <xuyu@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org, viro@...iv.linux.org.uk,
        dhowells@...hat.com
Subject: [PATCH] chardev: call tty_init() in real chrdev_init()

It is confusing that tty_init() in called in the initialization of
memdev, i.e., static chr_dev_init().

Through blame, it is introduced by commit 31d1d48e199e ("Fix init
ordering of /dev/console vs callers of modprobe"), which fixes the
initialization order of /dev/console driver. However, there seems
to be a typo in the patch, i.e., chrdev_init, instead of chr_dev_init.

This fixes the typo, IIUC.

Note that the return value of tty_init() is always 0, and thus no error
handling is provided in chrdev_init().

Fixes: 31d1d48e199e ("Fix init ordering of /dev/console vs callers of modprobe")
Signed-off-by: Xu Yu <xuyu@...ux.alibaba.com>
---
 drivers/char/mem.c | 2 +-
 fs/char_dev.c      | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index cc296f0823bd..8c90881f8115 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -775,7 +775,7 @@ static int __init chr_dev_init(void)
 			      NULL, devlist[minor].name);
 	}
 
-	return tty_init();
+	return 0;
 }
 
 fs_initcall(chr_dev_init);
diff --git a/fs/char_dev.c b/fs/char_dev.c
index ba0ded7842a7..fc042a0a098f 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -667,6 +667,7 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data)
 void __init chrdev_init(void)
 {
 	cdev_map = kobj_map_init(base_probe, &chrdevs_lock);
+	tty_init();
 }
 
 
-- 
2.20.1.2432.ga663e714