linux-kernel - request_firmware vs. resume (was Re: [PATCH] bnx2

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Message-ID: <20080709202547.GD11006@ucw.cz>
Date:	Wed, 9 Jul 2008 22:25:47 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	David Miller <davem@...emloft.net>
Cc:	alan@...rguk.ukuu.org.uk, mchan@...adcom.com, dwmw2@...radead.org,
	bastian@...di.eu.org, linux-kernel@...r.kernel.org
Subject: request_firmware vs. resume (was Re: [PATCH] bnx2 - use request_firmware())

Hi!

> > > The firmware needs to be reloaded every time the chip resets.
> > > You're not saving anything/
> > 
> > > See above, you aren't saving anything.  The firmware needs to stay
> > > around so it can be reloaded into the card during exceptions.
> > > 
> > > That is, unless you want a more failure prone system.
> > 
> > Ok so if tg3 always needs the same firmware and always needs it in memory
> > then maybe it isn't a significant candidate for request_firmware beyond
> > the neatness of distribution. I note the firmware hasn't changed in years
> > so it can easily be shipped separately and the one package would have
> > done for all this time.
> 
> It isn't just tg3.  All the broadcom gigabit chips need this
> kind of handling.
> 
> Basically all of the drivers we are pushing back on.
> 
> I bet there are other similar examples.

Be careful about request_firmware. Doing it right w.r.t.
suspend/resume is quite tricky: you have to load it from userspace
before kernel starts, so that you can use it during resume...

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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