linux-kernel - Re: [PATCH] video: fbdev: Convert timers to use timer

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Date:   Thu, 09 Nov 2017 18:08:26 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        David Lechner <david@...hnology.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>,
        Jean Delvare <jdelvare@...e.de>,
        Hans de Goede <hdegoede@...hat.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: fbdev: Convert timers to use timer_setup()

On Tuesday, October 24, 2017 08:20:26 AM Kees Cook wrote:

> diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
> index 933619da1a94..e88447eac32c 100644
> --- a/drivers/video/fbdev/pxa3xx-gcu.c
> +++ b/drivers/video/fbdev/pxa3xx-gcu.c
> @@ -513,16 +513,10 @@ pxa3xx_gcu_mmap(struct file *file, struct vm_area_struct *vma)
>  #ifdef PXA3XX_GCU_DEBUG_TIMER
>  static struct timer_list pxa3xx_gcu_debug_timer;
>  
> -static void pxa3xx_gcu_debug_timedout(unsigned long ptr)
> +static void pxa3xx_gcu_debug_timedout(struct timer_list *unused)
>  {
> -	struct pxa3xx_gcu_priv *priv = (struct pxa3xx_gcu_priv *) ptr;
> -
>  	QERROR("Timer DUMP");

QERROR() macro is using priv so this code now fails to build.

[ Please compile these timer changes with PXA3XX_GCU_DEBUG and
  PXA3XX_GCU_DEBUG_TIMER defined. ]

Also please port your changes over fbdvev-for-next tree as
currently this patch doesn't apply (fbdev tree contains
"video: fbdev: pxa3xx_gcu: Use setup_timer and mod_timer"
cleanup).

> -	/* init the timer structure */
> -	init_timer(&pxa3xx_gcu_debug_timer);
> -	pxa3xx_gcu_debug_timer.function = pxa3xx_gcu_debug_timedout;
> -	pxa3xx_gcu_debug_timer.data = ptr;
>  	pxa3xx_gcu_debug_timer.expires = jiffies + 5*HZ; /* one second */
>  
>  	add_timer(&pxa3xx_gcu_debug_timer);
> @@ -530,7 +524,9 @@ static void pxa3xx_gcu_debug_timedout(unsigned long ptr)
>  
>  static void pxa3xx_gcu_init_debug_timer(void)
>  {
> -	pxa3xx_gcu_debug_timedout((unsigned long) &pxa3xx_gcu_debug_timer);
> +	/* init the timer structure */
> +	timer_setup(&pxa3xx_gcu_debug_timer, pxa3xx_gcu_debug_timedout, 0);
> +	pxa3xx_gcu_debug_timedout(NULL);
>  }
>  #else
>  static inline void pxa3xx_gcu_init_debug_timer(void) {}

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics