netdev - Re: [PATCH 1/2 v4] usbnet: allow status interrupt URB to always be active

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Message-ID: <87li8q5xgi.fsf@nemi.mork.no>
Date:	Wed, 10 Apr 2013 15:25:49 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Dan Williams <dcbw@...hat.com>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Oliver Neukum <oliver@...kum.org>,
	Elina Pasheva <epasheva@...rrawireless.com>,
	Network Development <netdev@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Rory Filer <rfiler@...rrawireless.com>,
	Phil Sutter <phil@....cc>
Subject: Re: [PATCH 1/2 v4] usbnet: allow status interrupt URB to always be active

Dan Williams <dcbw@...hat.com> writes:

> +int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
> +{
> +	/* Only drivers that implement a status hook should call this */
> +	BUG_ON(dev->interrupt == NULL);
> 
I still don't think there is any reason to BUG out. See for example
http://article.gmane.org/gmane.linux.kernel/52102

> +static void __usbnet_status_stop(struct usbnet *dev, bool force)
> +{
> +	if (dev->interrupt) {
> +		mutex_lock(&dev->interrupt_mutex);
> +		if (!force)
> +			BUG_ON(dev->interrupt_count == 0);

Same here.  You can deal with this just fine.  Warn once, and go on
ignoring the problem.  Why kill the machine because of some minor driver
issue?



Bjørn
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