Date: Mon, 2 Jan 2012 23:50:44 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jack Stone <jwjstone@fastmail.fm>,
	Alan Stern <stern@rowland.harvard.edu>,
	Oliver Neukum <oliver@neukum.org>,
	Matthew Garrett <mjg@redhat.com>,
	Dave Jones <davej@redhat.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Chaoming Li <chaoming_li@realsil.com.cn>,
	"John W. Linville" <linville@tuxdriver.com>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	USB list <linux-usb@vger.kernel.org>,
	Linux Wireless List <linux-wireless@vger.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.
Message-ID: <20120102235044.23935096@pyramind.ukuu.org.uk> (sfid-20120103_005116_568271_29E5ECEB)
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> So the only thing we need is to fix the braindamaged firmware
> interfaces. We need caching, and we need to replace (or at least
> extend) "load_firware()" with "[get|put]_firmware()".

So at what moment after a resume does a firmware that was in use with a
device go away and what do we do about devices inserted while suspended ?

Remembering that

- there is no moment when USB says 'we have finished re-enumeration'.
  There is no point at which you can say 'we have finished
  re-enumeration, we are now starting on enumeration of new stuff'. New
  stuff wanting firmware will pop up on resume mixed in with old stuff.

- we don't seem to have any device or bus infrastructure for doing a
  'post resume' purge of such data if we could decide when that moment
  is ?

Alan