linux-kernel - Re: [PATCH 2/2] extcon: arizona: Fix reset of HPDET after race with removal

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Message-ID: <20131026162907.GC7698@lee--X1>
Date:	Sat, 26 Oct 2013 09:29:07 -0700
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	cw00.choi@...sung.com, myungjoo.ham@...sung.com,
	sameo@...ux.intel.com, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] extcon: arizona: Fix reset of HPDET after race with
 removal

On Sat, 26 Oct 2013, Charles Keepax wrote:

> We need to make sure we reset back to our starting state, especially
> making sure that we have disabled poll in the register cache.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/extcon/extcon-arizona.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index 92eb486..3ce7b49 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -572,6 +572,14 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
>  		goto out;
>  	} else if (!ret) {
>  		dev_dbg(arizona->dev, "Ignoring HPDET for removed cable\n");
> +
> +		/* Reset back to starting range */
> +		regmap_update_bits(arizona->regmap,
> +				   ARIZONA_HEADPHONE_DETECT_1,
> +				   ARIZONA_HP_IMPEDANCE_RANGE_MASK |
> +				   ARIZONA_HP_POLL,
> +				   0);
> +
>  		goto done;
>  	}
>  
> @@ -607,9 +615,9 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
>  		dev_err(arizona->dev, "Failed to report HP/line: %d\n",
>  			ret);
>  
> +done:
>  	arizona_extcon_do_magic(info, 0);
>  
> -done:
>  	if (id_gpio)
>  		gpio_set_value_cansleep(id_gpio, 0);
>  

What happens if we don't update the bits and we still do magic in the
new error path? Does that adversely affect any later 'goto done's?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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