Re: [PATCH v2 1/2] char: pcmcia: cm4000_cs: Fix failure handling

[Greg KH]

On Tue, May 25, 2021 at 04:32:34AM +0530, nizamhaider786@xxxxxxxxx wrote:
> From: Nijam Haider <nizamhaider786@xxxxxxxxx>
> 
> Handled failure cases of device_create()
> 
> Signed-off-by: Nijam Haider <nizamhaider786@xxxxxxxxx>
> ---
> V1 -> V2: Added description and changelog
> ---
>  drivers/char/pcmcia/cm4000_cs.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
> index 89681f07bc78..1ed4eac6b8ef 100644
> --- a/drivers/char/pcmcia/cm4000_cs.c
> +++ b/drivers/char/pcmcia/cm4000_cs.c
> @@ -1783,6 +1783,7 @@ static int cm4000_probe(struct pcmcia_device *link)
>  {
>  	struct cm4000_dev *dev;
>  	int i, ret;
> +	struct device *dev_ret;
>  
>  	for (i = 0; i < CM4000_MAX_DEV; i++)
>  		if (dev_table[i] == NULL)
> @@ -1814,8 +1815,14 @@ static int cm4000_probe(struct pcmcia_device *link)
>  		return ret;
>  	}
>  
> -	device_create(cmm_class, NULL, MKDEV(major, i), NULL, "cmm%d", i);
> -
> +	dev_ret = device_create(cmm_class, NULL, MKDEV(major, i), NULL, "cmm%d", i);
> +	if (IS_ERR(dev_ret)) {
> +		dev_err(&link->dev, "device_create failed for %d\n", i);
> +		cm4000_release(link);
> +		dev_table[i] = NULL;
> +		kfree(dev);
> +		return -ENODEV;
> +	}

As before, make different err_*: labels and jump to them when cleaning
up.

thanks,

greg k-h