[PATCHv2 4/4] printk: make sure we always print console disabled message

From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Petr Mladek <pmladek@suse.com>, Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: [PATCHv2 4/4] printk: make sure we always print console disabled message
Date: Fri, 26 Apr 2019 14:33:02 +0900	[thread overview]
Message-ID: <20190426053302.4332-5-sergey.senozhatsky@gmail.com> (raw)
In-Reply-To: <20190426053302.4332-1-sergey.senozhatsky@gmail.com>

Make sure that we print 'console disabled' messages on all
the consoles, including the one we are about to unregister.
Otherwise, unregistered console will not have that message,
because pr_info() under console_sem doesn't print anything.

We do the same thing in __register_console() with the
'console enabled' message.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
 kernel/printk/printk.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 3b36e26d4a51..20c702b963a9 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2613,6 +2613,12 @@ static int __unregister_console(struct console *console)
 	pr_info("%sconsole [%s%d] disabled\n",
 		(console->flags & CON_BOOT) ? "boot" : "",
 		console->name, console->index);
+	/*
+	 * Print 'console disabled' on all the consoles, including the
+	 * one we are about to unregister.
+	 */
+	console_unlock();
+	console_lock();
 
 	res = _braille_unregister_console(console);
 	if (res)
-- 
2.21.0

