linux-kernel - Re: [PATCH 1/1] ice1712: check if snd card loaded, if not do not proceed

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Date:	Fri, 11 Jul 2014 12:06:39 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Konstantinos Tsimpoukas <kostaslinuxxx@...il.com>
Cc:	<alsa-devel@...a-project.org>, Jaroslav Kysela <perex@...ex.cz>,
	<linux-sound@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ice1712: check if snd card loaded, if not do not proceed

At Thu, 10 Jul 2014 23:19:37 -0500,
Konstantinos Tsimpoukas wrote:
> 
> Just adding a simple if statement, which
> verifies if actually card is loaded, if not
> does not continue with the execution
> of the snd_card_free.

It's already referenced by ice, so a NULL check must be peformed at
first.  But, basically card is always non-NULL.  The remove callback
is called only for objects that was properly bound with probe
callback.  snd_ice1712_probe() always sets the card pointer when it
succeeds.


thanks,

Takashi


> Signed-off-by: Konstantinos Tsimpoukas <kostaslinuxxx@...il.com>
> ---
>  sound/pci/ice1712/ice1712.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> index d9b9e45..431096b 100644
> --- a/sound/pci/ice1712/ice1712.c
> +++ b/sound/pci/ice1712/ice1712.c
> @@ -2819,7 +2819,8 @@ static void snd_ice1712_remove(struct pci_dev *pci)
>  
>  	if (ice->card_info && ice->card_info->chip_exit)
>  		ice->card_info->chip_exit(ice);
> -	snd_card_free(card);
> +	if (card)
> +		snd_card_free(card);
>  }
>  
>  #ifdef CONFIG_PM_SLEEP
> -- 
> 1.9.1
> 
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