linux-kernel - Re: [PATCH] emu10k1: correctly handling failed thread creation

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Date:	Fri, 29 Jan 2016 07:33:11 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Insu Yun" <wuninsu@...il.com>
Cc:	<alsa-devel@...a-project.org>, <michael@...noth.net>,
	<lambert.quentin@...il.com>, <pzubaj@...ticonet.sk>,
	<perex@...ex.cz>, <linux-kernel@...r.kernel.org>,
	<changwoo@...ech.edu>, <insu@...ech.edu>, <taesoo@...ech.edu>,
	<yeongjin.jang@...ech.edu>
Subject: Re: [PATCH] emu10k1: correctly handling failed thread creation

On Fri, 29 Jan 2016 00:51:37 +0100,
Insu Yun wrote:
> 
> Since kthread_create can be failed, it needs to check 
> whether error occurred and return error code.
> 
> Signed-off-by: Insu Yun <wuninsu@...il.com>
> ---
>  sound/pci/emu10k1/emu10k1_main.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
> index 28e2f8b..b9eac15 100644
> --- a/sound/pci/emu10k1/emu10k1_main.c
> +++ b/sound/pci/emu10k1/emu10k1_main.c
> @@ -1141,6 +1141,12 @@ static int snd_emu10k1_emu1010_init(struct snd_emu10k1 *emu)
>  		emu->emu1010.firmware_thread =
>  			kthread_create(emu1010_firmware_thread, emu,
>  				       "emu1010_firmware");
> +		if (IS_ERR(emu->emu1010.firmware_thread)) {
> +			dev_info(emu->card->dev,
> +					"emu1010: Creating thread failed\n");
> +			return PTR_ERR(emu->emu1010.firmware_thread);

It needs to NULL-clear emu->emu1010.firmware_thread after this, since
kthread_stop() is called for non-NULL case in the destructor.  Could
you fix it and resubmit?


thanks,

Takashi

> +		}
> +
>  		wake_up_process(emu->emu1010.firmware_thread);
>  	}
>  
> -- 
> 1.9.1
> 
>