netdev - Re: [PATCH] mac80211: Fix TX after monitor interface is converted to managed

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Message-ID: <ada4ph6bm8h.fsf@cisco.com>
Date:	Thu, 04 Oct 2007 14:31:26 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Michael Wu <flamingice@...rmilk.net>,
	Michael Buesch <mb@...sch.de>, Daniel Drake <dsd@...too.org>,
	johannes@...solutions.net, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: [PATCH] mac80211: Fix TX after monitor interface is converted to managed

 > Programming with assertions (and BUG_ON is a form of that) is
 > generally a good practice.  Almost any book or other source on
 > good programming practices will agree.  Yes, it can be overdone.
 > But I don't really think that is the case here, since the check is
 > relatively inexpensive and the consequence should it ever *somehow*
 > happen could be a something wierd (crash, corruption, etc) w/o any
 > other indication of what occured.

The problem with BUG_ON is that it kills the whole system.  So every
time you add a BUG_ON into code, you have to weigh whether the problem
you detected is so severe that the right response is to panic.  For
example, I can see panicking on something fundamental like corrupted
page tables.  However I would submit that the wireless stack should
*never* use BUG_ON -- printing a warning and trying to limp on seems
preferable to me.

 - R.
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