linux-kernel - Re: [PATCH tty v1 3/8] serial: 8250: lock port for stop_rx() in omap8250

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Message-ID: <20230526090050.GD14287@atomide.com>
Date:   Fri, 26 May 2023 12:00:50 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH tty v1 3/8] serial: 8250: lock port for stop_rx() in
 omap8250_irq()

* John Ogness <john.ogness@...utronix.de> [230525 09:34]:
> The uarts_ops stop_rx() callback expects that the port->lock is
> taken and interrupts are disabled.
> 
> Fixes: 1fe0e1fa3209 ("serial: 8250_omap: Handle optional overrun-throttle-ms property")
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

Looks good to me:

Reviewed-by: Tony Lindgren <tony@...mide.com>

> ---
>  drivers/tty/serial/8250/8250_omap.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
> index fbca0692aa51..c17d98161d5e 100644
> --- a/drivers/tty/serial/8250/8250_omap.c
> +++ b/drivers/tty/serial/8250/8250_omap.c
> @@ -658,7 +658,9 @@ static irqreturn_t omap8250_irq(int irq, void *dev_id)
>  
>  		up->ier = port->serial_in(port, UART_IER);
>  		if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) {
> +			spin_lock(&port->lock);
>  			port->ops->stop_rx(port);
> +			spin_unlock(&port->lock);
>  		} else {
>  			/* Keep restarting the timer until
>  			 * the input overrun subsides.
> -- 
> 2.30.2
>