patch "serial: imx: Initialize lock for non-registered console" added to tty-testing

patch "serial: imx: Initialize lock for non-registered console" added to tty-testing

[gregkh]

This is a note to let you know that I've just added the patch titled

    serial: imx: Initialize lock for non-registered console

to my tty git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the tty-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


From 8f065acec7573672dd15916e31d1e9b2e785566c Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 25 May 2020 13:59:52 +0300
Subject: serial: imx: Initialize lock for non-registered console

The commit a3cb39d258ef
("serial: core: Allow detach and attach serial device for console")
changed a bit logic behind lock initialization since for most of the console
driver it's supposed to have lock already initialized even if console is not
enabled. However, it's not the case for Freescale IMX console.

Initialize lock explicitly in the ->probe().

Note, there is still an open question should or shouldn't not this driver
register console properly.

Fixes: a3cb39d258ef ("serial: core: Allow detach and attach serial device for console")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200525105952.13744-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/serial/imx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 986d902fb7fe..6b078e395931 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2404,6 +2404,9 @@ static int imx_uart_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* We need to initialize lock even for non-registered console */
+	spin_lock_init(&sport->port.lock);
+
 	imx_uart_ports[sport->port.line] = sport;
 
 	platform_set_drvdata(pdev, sport);
-- 
2.26.2