Re: [linux-usb-devel] [PATCH 02/02] USB: add dynamic id functionality to USB core

[Alan Stern <stern@rowland.harvard.edu>]

A few minor comments...

On Wed, 16 Nov 2005, Greg KH wrote:

> +static ssize_t store_new_id(struct device_driver *driver,
> +			    const char *buf, size_t count)
> +{
> +	struct usb_driver *usb_drv = to_usb_driver(driver);
> +	struct usb_dynid *dynid;
> +	u32 idVendor = 0;
> +	u32 idProduct = 0;
> +	int fields = 0;
> +
> +	fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
> +	if (fields < 0)
> +		return -EINVAL;

Don't you want to test (fields < 2)?

> +	if (get_driver(&usb_drv->driver)) {
> +		driver_attach(&usb_drv->driver);
> +		put_driver(&usb_drv->driver);
> +	}

Here you don't have to refer to &usb_drv->driver; you can just refer to 
driver.

> +static int usb_create_newid_file(struct usb_driver *usb_drv)
> +{
> +	int error = 0;
> +
> +	if (usb_drv->probe != NULL)
> +		error = sysfs_create_file(&usb_drv->driver.kobj,
> +					  &driver_attr_new_id.attr);
> +	return error;
> +}

This deserves to be an inline function.

> +static void usb_free_dynids(struct usb_driver *usb_drv)
> +{
> +	struct usb_dynid *dynid, *n;
> +
> +	spin_lock(&usb_drv->dynids.lock);
> +	list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
> +		list_del(&dynid->node);
> +		kfree(dynid);
> +	}
> +	spin_unlock(&usb_drv->dynids.lock);
> +}

This could be inline as well, although being longer, its overhead is less 
noticeable.

Alan Stern

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