linux-kernel - Re: [PATCH] ALSA: via82xx: Use common error handling code in snd_via82xx

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Date:   Tue, 22 Aug 2017 19:57:46 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "SF Markus Elfring" <elfring@...rs.sourceforge.net>
Cc:     <alsa-devel@...a-project.org>,
        "Julia Lawall" <Julia.Lawall@...6.fr>,
        "Jaroslav Kysela" <perex@...ex.cz>,
        <kernel-janitors@...r.kernel.org>,
        "LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ALSA: via82xx: Use common error handling code in snd_via82xx_create()

On Tue, 22 Aug 2017 19:43:08 +0200,
SF Markus Elfring wrote:
> 
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 22 Aug 2017 19:37:26 +0200
> 
> Add jump targets so that a bit of exception handling can be better reused
> at the end of this function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  sound/pci/via82xx_modem.c | 33 +++++++++++++++++++--------------
>  1 file changed, 19 insertions(+), 14 deletions(-)
> 
> diff --git a/sound/pci/via82xx_modem.c b/sound/pci/via82xx_modem.c
> index 55f79b2599e7..8659776887b2 100644
> --- a/sound/pci/via82xx_modem.c
> +++ b/sound/pci/via82xx_modem.c
> @@ -1110,8 +1110,8 @@ static int snd_via82xx_create(struct snd_card *card,
>  		return err;
>  
>  	if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
> -		pci_disable_device(pci);
> -		return -ENOMEM;
> +		err = -ENOMEM;
> +		goto disable_device;
>  	}
>  
>  	spin_lock_init(&chip->reg_lock);
> @@ -1121,30 +1121,27 @@ static int snd_via82xx_create(struct snd_card *card,
>  
>  	if ((err = pci_request_regions(pci, card->driver)) < 0) {
>  		kfree(chip);
> -		pci_disable_device(pci);
> -		return err;
> +		goto disable_device;
>  	}
>  	chip->port = pci_resource_start(pci, 0);
>  	if (request_irq(pci->irq, snd_via82xx_interrupt, IRQF_SHARED,
>  			KBUILD_MODNAME, chip)) {
>  		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
> -		snd_via82xx_free(chip);
> -		return -EBUSY;
> +		err = -EBUSY;
> +		goto free_chip;
>  	}
>  	chip->irq = pci->irq;
>  	if (ac97_clock >= 8000 && ac97_clock <= 48000)
>  		chip->ac97_clock = ac97_clock;
>  	synchronize_irq(chip->irq);
>  
> -	if ((err = snd_via82xx_chip_init(chip)) < 0) {
> -		snd_via82xx_free(chip);
> -		return err;
> -	}
> +	err = snd_via82xx_chip_init(chip);
> +	if (err < 0)
> +		goto free_chip;
>  
> -	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
> -		snd_via82xx_free(chip);
> -		return err;
> -	}
> +	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
> +	if (err < 0)
> +		goto free_chip;
>  
>  	/* The 8233 ac97 controller does not implement the master bit
>  	 * in the pci command register. IMHO this is a violation of the PCI spec.
> @@ -1153,6 +1150,14 @@ static int snd_via82xx_create(struct snd_card *card,
>  
>  	*r_via = chip;
>  	return 0;
> +
> +disable_device:
> +	pci_disable_device(pci);
> +	goto exit;
> +free_chip:
> +	snd_via82xx_free(chip);
> +exit:
> +	return err;

Doubly goto doesn't look like an improvement.


Takashi