linux-kernel - Re: [PATCH v2] video: imxfb: Do not crash on reboot

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Date:	Tue, 9 Oct 2012 06:42:01 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Fabio Estevam <festevam@...il.com>
Cc:	kernel@...gutronix.de, Fabio Estevam <fabio.estevam@...escale.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	FlorianSchandinat@....de
Subject: Re: [PATCH v2] video: imxfb: Do not crash on reboot

Hi Fabio,

On Mon, Oct 08, 2012 at 07:23:58PM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@...escale.com>
> 
> Issuing a "reboot" command after the LCD times out causes the following
> warnings:

[snip]

> @@ -513,47 +514,53 @@ static void imxfb_exit_backlight(struct imxfb_info 
> *fbi)
>  
>  static void imxfb_enable_controller(struct imxfb_info *fbi)
>  {
> -	pr_debug("Enabling LCD controller\n");
> +	if (!fbi->enabled) {
> +		pr_debug("Enabling LCD controller\n");

Won't it be simpler to just do:

    if (fbi->enabled)
        return;

instead of adding another nesting level to the whole routine?

>  static void imxfb_disable_controller(struct imxfb_info *fbi)
>  {
> -	pr_debug("Disabling LCD controller\n");
> +	if (fbi->enabled) {
> +		pr_debug("Disabling LCD controller\n");

ditto (with inverted logic).

baruch

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