linux-kernel - Re: [PATCH 3/8] cxacru: check device isn't being removed during sysfs calls

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Date:	Sat, 21 Nov 2009 16:24:16 +0100
From:	Duncan Sands <duncan.sands@...h.u-psud.fr>
To:	Simon Arlott <simon@...e.lp0.eu>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 3/8] cxacru: check device isn't being removed during sysfs
 calls

Hi Simon,

> +static inline void *to_usbatm_driver_data(struct usb_interface *intf)
> +{
> +	struct usbatm_data *usbatm_instance;
> +
> +	if (intf == NULL)
> +		return NULL;
> +
> +	usbatm_instance = usb_get_intfdata(intf);
> +
> +	if (usbatm_instance == NULL) /* set NULL before unbind() */
> +		return NULL;
> +
> +	return usbatm_instance->driver_data; /* set NULL after unbind() */
> +}
> +
> +static inline void *to_usbatm_atm_dev(struct usb_interface *intf)
> +{
> +	struct usbatm_data *usbatm_instance;
> +
> +	if (intf == NULL)
> +		return NULL;
> +
> +	usbatm_instance = usb_get_intfdata(intf);
> +
> +	if (usbatm_instance == NULL) /* set NULL before unbind() */
> +		return NULL;
> +
> +	return usbatm_instance->atm_dev; /* set NULL after unbind() */
> +}
> +

why not collapse these two into one that just returns usbatm_instance,
and have users extract the ->driver_data or ->atm_dev fields?

Ciao,

Duncan.
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