linux-kernel - Re: [PATCH] serial: 8250: Convert timers to use timer

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Message-ID: <1509034931.10233.3.camel@linux.intel.com>
Date:   Thu, 26 Oct 2017 19:22:11 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.com>, Vignesh R <vigneshr@...com>,
        Ed Blake <ed.blake@...tec.com>,
        Matthias Brugger <mbrugger@...e.com>,
        Sean Young <sean@...s.org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250: Convert timers to use timer_setup()

On Tue, 2017-10-24 at 02:59 -0700, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list
> pointer to
> all timer callbacks, switch to using the new timer_setup() and
> from_timer()
> to pass the timer pointer explicitly.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jslaby@...e.com>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Vignesh R <vigneshr@...com>
> Cc: Ed Blake <ed.blake@...tec.com>
> Cc: Matthias Brugger <mbrugger@...e.com>
> Cc: Sean Young <sean@...s.org>
> Cc: linux-serial@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/tty/serial/8250/8250_core.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_core.c
> b/drivers/tty/serial/8250/8250_core.c
> index 00d4b114f1bf..ccfc42ca846d 100644
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -262,17 +262,17 @@ static void serial_unlink_irq_chain(struct
> uart_8250_port *up)
>   * barely passable results for a 16550A.  (Although at the expense
>   * of much CPU overhead).
>   */
> -static void serial8250_timeout(unsigned long data)
> +static void serial8250_timeout(struct timer_list *t)
>  {
> -	struct uart_8250_port *up = (struct uart_8250_port *)data;
> +	struct uart_8250_port *up = from_timer(up, t, timer);
>  
>  	up->port.handle_irq(&up->port);
>  	mod_timer(&up->timer, jiffies + uart_poll_timeout(&up-
> >port));
>  }
>  
> -static void serial8250_backup_timeout(unsigned long data)
> +static void serial8250_backup_timeout(struct timer_list *t)
>  {
> -	struct uart_8250_port *up = (struct uart_8250_port *)data;
> +	struct uart_8250_port *up = from_timer(up, t, timer);
>  	unsigned int iir, ier = 0, lsr;
>  	unsigned long flags;
>  
> @@ -329,8 +329,7 @@ static int univ8250_setup_irq(struct
> uart_8250_port *up)
>  	if (up->bugs & UART_BUG_THRE) {
>  		pr_debug("ttyS%d - using backup timer\n",
> serial_index(port));
>  
> -		up->timer.function = serial8250_backup_timeout;
> -		up->timer.data = (unsigned long)up;
> +		up->timer.function =
> (TIMER_FUNC_TYPE)serial8250_backup_timeout;
>  		mod_timer(&up->timer, jiffies +
>  			  uart_poll_timeout(port) + HZ / 5);
>  	}
> @@ -341,7 +340,6 @@ static int univ8250_setup_irq(struct
> uart_8250_port *up)
>  	 * driver used to do this with IRQ0.
>  	 */
>  	if (!port->irq) {
> -		up->timer.data = (unsigned long)up;
>  		mod_timer(&up->timer, jiffies +
> uart_poll_timeout(port));
>  	} else
>  		retval = serial_link_irq_chain(up);
> @@ -354,7 +352,7 @@ static void univ8250_release_irq(struct
> uart_8250_port *up)
>  	struct uart_port *port = &up->port;
>  
>  	del_timer_sync(&up->timer);
> -	up->timer.function = serial8250_timeout;
> +	up->timer.function = (TIMER_FUNC_TYPE)serial8250_timeout;
>  	if (port->irq)
>  		serial_unlink_irq_chain(up);
>  }
> @@ -525,7 +523,7 @@ static void __init serial8250_isa_init_ports(void)
>  			base_ops = port->ops;
>  		port->ops = &univ8250_port_ops;
>  
> -		setup_timer(&up->timer, serial8250_timeout, 0UL);
> +		timer_setup(&up->timer, serial8250_timeout, 0);
>  
>  		up->ops = &univ8250_driver_ops;
>  
> -- 
> 2.7.4
> 
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy