linux-kernel - Re: [PATCH v2 2/2] char: pcmcia: cm4040

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Message-ID: <YK+UeEK0iyLPl0tg@kroah.com>
Date:   Thu, 27 May 2021 14:45:44 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     nizamhaider786@...il.com
Cc:     laforge@...monks.org, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] char: pcmcia: cm4040_cs: Fix failure handling

On Tue, May 25, 2021 at 04:32:35AM +0530, nizamhaider786@...il.com wrote:
> From: Nijam Haider <nizamhaider786@...il.com>
> 
> Handled failure cases of device_create()
> 
> Signed-off-by: Nijam Haider <nizamhaider786@...il.com>
> ---
> V1 -> V2: Added description and changelog
> ---
>  drivers/char/pcmcia/cm4040_cs.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
> index d5e43606339c..526198be91fa 100644
> --- a/drivers/char/pcmcia/cm4040_cs.c
> +++ b/drivers/char/pcmcia/cm4040_cs.c
> @@ -558,6 +558,7 @@ static void reader_release(struct pcmcia_device *link)
>  static int reader_probe(struct pcmcia_device *link)
>  {
>  	struct reader_dev *dev;
> +	struct device *dev_ret;
>  	int i, ret;
>  
>  	for (i = 0; i < CM_MAX_DEV; i++) {
> @@ -593,8 +594,14 @@ static int reader_probe(struct pcmcia_device *link)
>  		return ret;
>  	}
>  
> -	device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
> -
> +	dev_ret = device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
> +	if (IS_ERR(dev_ret)) {
> +		dev_err(&link->dev, "device_create failed for %d\n", i);
> +		reader_release(link);
> +		dev_table[i] = NULL;
> +		kfree(dev);
> +		return -ENODEV;
> +	}

Same comment as on patch 1/2.

thanks,

greg k-h