linux-kernel - [PATCH] serial: earlycon: Only try fdt when specify 'earlycon' exactly

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Date:   Sat, 19 Aug 2017 09:43:17 +0800
From:   Jeffy Chen <jeffy.chen@...k-chips.com>
To:     linux-kernel@...r.kernel.org
Cc:     briannorris@...omium.org, dianders@...omium.org,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.com>
Subject: [PATCH] serial: earlycon: Only try fdt when specify 'earlycon' exactly

When moving earlycon early_param handling to serial, the devicetree
earlycons enable condition changed slightly.

We used to only do that for 'console'/'earlycon', but now would also
for 'console='/'earlycon='.

Fix it by using the same condition like before.

Fixes: d503187b6cc4 (of/serial: move earlycon early_param handling to serial)
Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
---

 drivers/tty/serial/earlycon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index c3651540e1ba..335933e1822c 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -220,7 +220,7 @@ static int __init param_setup_earlycon(char *buf)
 		if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
 			earlycon_init_is_deferred = true;
 			return 0;
-		} else {
+		} else if (!buf) {
 			return early_init_dt_scan_chosen_stdout();
 		}
 	}
-- 
2.11.0