linux-kernel - Re: [PATCH] tty: serial_core: recover uport->cons->cflag on uart

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Date:   Tue, 18 Jun 2019 09:51:29 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     kpark3469@...il.com
Cc:     jslaby@...e.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, keun-o.park@...kmatter.ae
Subject: Re: [PATCH] tty: serial_core: recover uport->cons->cflag on
 uart_close

On Sun, Jun 16, 2019 at 06:57:14PM +0400, kpark3469@...il.com wrote:
> From: Sahara <keun-o.park@...kmatter.ae>

I need a "full" name here please, something you use to sign legal
documents.

> Since uart_close was converted to use tty_port_close, uart_shutdown
> also moved to uart_tty_port_shutdown, which means it does not backup
> tty's termios to uart_port.console.cflag when console is closed and
> uart_console is true.
> By losing this value, serial console was not set correctly especially
> after suspend/resume when there is no consumer of console device.
> This problem resets console driver's configuration to an unwanted value
> and may give a performance regression in the system eventually.
> This patch fixes the bug introduced from v4.9 kernel.
> 
> Fixes: 761ed4a94582 ("tty: serial_core: convert uart_close to use tty_port_close")
> Reported-by: Jouni Linnamaa <Jouni.Linnamaa@...kmatter.ae>
> Signed-off-by: Sahara <keun-o.park@...kmatter.ae>

Same here as well.

thanks,

greg k-h