linux-kernel - Re: [PATCH v2 1/3] mfd: arizona: Correctly clean up after IRQs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20161122125538.GA316@dell.lan>
Date:   Tue, 22 Nov 2016 12:57:54 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:     linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH v2 1/3] mfd: arizona: Correctly clean up after IRQs

On Mon, 14 Nov 2016, Charles Keepax wrote:

> Currently we leak a lot of things when tearing down the IRQs this patch
> fixes this cleaning up both the IRQ mappings and the IRQ domain itself.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
> 
> Changes since v1:
>  - Correct handling of ret and error messages from irq_create_mapping
> 
> Thanks,
> Charles
> 
>  drivers/mfd/arizona-irq.c | 54 +++++++++++++++++++++++++++++++++++------------
>  1 file changed, 40 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
> index 2e01975..bc3b342 100644
> --- a/drivers/mfd/arizona-irq.c
> +++ b/drivers/mfd/arizona-irq.c
> @@ -207,6 +207,7 @@ int arizona_irq_init(struct arizona *arizona)
>  	int ret, i;
>  	const struct regmap_irq_chip *aod, *irq;
>  	struct irq_data *irq_data;
> +	unsigned int virq;
>  
>  	arizona->ctrlif_error = true;
>  
> @@ -318,24 +319,34 @@ int arizona_irq_init(struct arizona *arizona)
>  	}
>  
>  	if (aod) {
> -		ret = regmap_add_irq_chip(arizona->regmap,
> -					  irq_create_mapping(arizona->virq, 0),
> -					  IRQF_ONESHOT, 0, aod,
> -					  &arizona->aod_irq_chip);
> +		virq = irq_create_mapping(arizona->virq, 0);

I would like to see all of the '0's and '1's defined please.

> +		if (!virq) {
> +			dev_err(arizona->dev, "Failed to map AOD IRQs\n");
> +			ret = -EINVAL;
> +			goto err_domain;
> +		}
> +
> +		ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
> +					  0, aod, &arizona->aod_irq_chip);
>  		if (ret != 0) {
>  			dev_err(arizona->dev,
>  				"Failed to add AOD IRQs: %d\n", ret);
> -			goto err;
> +			goto err_map_aod;
>  		}
>  	}
>  
> -	ret = regmap_add_irq_chip(arizona->regmap,
> -				  irq_create_mapping(arizona->virq, 1),
> -				  IRQF_ONESHOT, 0, irq,
> -				  &arizona->irq_chip);
> +	virq = irq_create_mapping(arizona->virq, 1);
> +	if (!virq) {
> +		dev_err(arizona->dev, "Failed to map main IRQs\n");
> +		ret = -EINVAL;
> +		goto err_aod;
> +	}
> +
> +	ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
> +				  0, irq, &arizona->irq_chip);
>  	if (ret != 0) {
>  		dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret);
> -		goto err_aod;
> +		goto err_map_main_irq;
>  	}
>  
>  	/* Used to emulate edge trigger and to work around broken pinmux */
> @@ -400,23 +411,38 @@ int arizona_irq_init(struct arizona *arizona)
>  err_main_irq:
>  	regmap_del_irq_chip(irq_find_mapping(arizona->virq, 1),
>  			    arizona->irq_chip);
> +err_map_main_irq:
> +	irq_dispose_mapping(irq_find_mapping(arizona->virq, 1));
>  err_aod:
>  	regmap_del_irq_chip(irq_find_mapping(arizona->virq, 0),
>  			    arizona->aod_irq_chip);
> +err_map_aod:
> +	irq_dispose_mapping(irq_find_mapping(arizona->virq, 0));
> +err_domain:
> +	irq_domain_remove(arizona->virq);
>  err:
>  	return ret;
>  }
>  
>  int arizona_irq_exit(struct arizona *arizona)
>  {
> +	unsigned int virq;
> +
>  	if (arizona->ctrlif_error)
>  		free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR),
>  			 arizona);
>  	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
> -	regmap_del_irq_chip(irq_find_mapping(arizona->virq, 1),
> -			    arizona->irq_chip);
> -	regmap_del_irq_chip(irq_find_mapping(arizona->virq, 0),
> -			    arizona->aod_irq_chip);
> +
> +	virq = irq_find_mapping(arizona->virq, 1);
> +	regmap_del_irq_chip(virq, arizona->irq_chip);
> +	irq_dispose_mapping(virq);
> +
> +	virq = irq_find_mapping(arizona->virq, 0);
> +	regmap_del_irq_chip(virq, arizona->aod_irq_chip);
> +	irq_dispose_mapping(virq);
> +
> +	irq_domain_remove(arizona->virq);
> +
>  	free_irq(arizona->irq, arizona);
>  
>  	return 0;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog