Re: [PATCH v2] serial: sh-sci: Use spin_{try}lock_irqsave instead of open coding version

[Sebastian Andrzej Siewior]

On 2018-05-04 18:30:41 [+0200], Daniel Wagner wrote:
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -2890,16 +2890,16 @@ static void serial_console_write(struct console *co, const char *s,
>  	unsigned long flags;
>  	int locked = 1;
>  
> -	local_irq_save(flags);
>  #if defined(SUPPORT_SYSRQ)
> -	if (port->sysrq)
> +	if (port->sysrq) {
>  		locked = 0;
> -	else
> +		local_irq_save(flags);

how is this helping? You should see a splat after a sysrq request.

> +	} else
>  #endif
>  	if (oops_in_progress)
> -		locked = spin_trylock(&port->lock);
> +		locked = spin_trylock_irqsave(&port->lock, flags);
>  	else
> -		spin_lock(&port->lock);
> +		spin_lock_irqsave(&port->lock, flags);
>  
>  	/* first save SCSCR then disable interrupts, keep clock source */
>  	ctrl = serial_port_in(port, SCSCR);

Sebastian