linux-kernel - [PATCH] printk: Set console_set_on_cmdline=1 when using console="" or console=null

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Date:   Fri, 28 Jan 2022 00:00:52 +0100
From:   Andre Kalb <svc.sw.rte.linux@....de>
To:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] printk: Set console_set_on_cmdline=1 when using console=""
 or console=null

In case of using console="" or console=null set console_set_on_cmdline=1
to disable chosen{ "stdout-path" } node from devicetree.

To jump out from drivers/of/base.c, line 2087 of_console_check function
with false.

Signed-off-by: Andre Kalb <andre.kalb@....de>
---
 kernel/printk/printk.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 82abfaf3c2aa..df5ab35b8af2 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2385,6 +2385,7 @@ static int __init console_setup(char *str)
 	 */
 	if (str[0] == 0 || strcmp(str, "null") == 0) {
 		__add_preferred_console("ttynull", 0, NULL, NULL, true);
+		console_set_on_cmdline = 1;
 		return 1;
 	}
 
-- 
2.31.1