linux-kernel - Re: [PATCH] omap: DT node Timer iteration fix

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Message-ID: <50EDEB64.4060800@ti.com>
Date:	Wed, 9 Jan 2013 16:12:52 -0600
From:	Jon Hunter <jon-hunter@...com>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
CC:	unlisted-recipients:; Tony Lindgren <tony@...mide.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Benoit Cousson <b-cousson@...com>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Matt Porter <mporter@...com>, Russ Dill <Russ.Dill@...com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Joel A Fernandes <agnel.joel@...il.com>,
	Rob Clark <robdclark@...il.com>,
	Jason Kridner <jkridner@...gleboard.org>,
	Matt Ranostay <mranostay@...il.com>
Subject: Re: [PATCH] omap: DT node Timer iteration fix

Hi Pantelis,

On 01/08/2013 07:31 AM, Pantelis Antoniou wrote:
> The iterator correctly handles of_node_put() calls.
> Remove it before continue'ing the loop.
> Without this patch you get:

Thanks for the fix!

May be worth mentioning that this will only be seen with
"CONFIG_OF_DYNAMIC" (and explains why I did not catch this one!).

> ERROR: Bad of_node_put() on /ocp/timer@...31000!
> [<c001329c>] (unwind_backtrace+0x0/0xe0) from [<c03dd8f0>] (of_node_release+0x2c/0xa0)!
> [<c03dd8f0>] (of_node_release+0x2c/0xa0) from [<c03ddea0>] (of_find_matching_node_and_match+0x78/0x90)!
> [<c03ddea0>] (of_find_matching_node_and_match+0x78/0x90) from [<c06d349c>] (omap_get_timer_dt+0x78/0x90)!
> [<c06d349c>] (omap_get_timer_dt+0x78/0x90) from [<c06d3664>] (omap_dm_timer_init_one.clone.2+0x34/0x2bc)!
> [<c06d3664>] (omap_dm_timer_init_one.clone.2+0x34/0x2bc) from [<c06d3a2c>] (omap2_gptimer_clocksource_init.clone.4+0x24/0xa8)!
> [<c06d3a2c>] (omap2_gptimer_clocksource_init.clone.4+0x24/0xa8) from [<c06cca58>] (time_init+0x20/0x30)!
> [<c06cca58>] (time_init+0x20/0x30) from [<c06c9690>] (start_kernel+0x1a8/0x2fc)!
> 
> Signed-off-by: Pantelis Antoniou <panto@...oniou-consulting.com>
> ---
>  arch/arm/mach-omap2/timer.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index 691aa67..b8ad6e6 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -165,15 +165,11 @@ static struct device_node * __init omap_get_timer_dt(struct of_device_id *match,
>  	struct device_node *np;
>  
>  	for_each_matching_node(np, match) {
> -		if (!of_device_is_available(np)) {
> -			of_node_put(np);
> +		if (!of_device_is_available(np))
>  			continue;
> -		}
>  
> -		if (property && !of_get_property(np, property, NULL)) {
> -			of_node_put(np);
> +		if (property && !of_get_property(np, property, NULL))
>  			continue;
> -		}
>  
>  		of_add_property(np, &device_disabled);
>  		return np;

Otherwise ...

Acked-by: Jon Hunter <jon-hunter@...com>

Cheers
Jon

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