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From: Oliver Neukum <oliver@neukum.org>
To: linux-usb-devel@lists.sourceforge.net
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Sven Luther <sven.luther@wanadoo.fr>,
	Alan Cox <alan@www.pagan.org.uk>, Nicolas DET <nd@bplan-gmbh.de>,
	linuxppc-dev list <linuxppc-dev@lists.linuxppc.org>
Subject: Re: [linux-usb-devel] [Patch] for UHCI driver (from kernel 2.6.6).
Date: Sat, 19 Jun 2004 08:53:26 +0200	[thread overview]
Message-ID: <200406190853.32745.oliver@neukum.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0406181737520.1334-100000@ida.rowland.org>



Am Freitag, 18. Juni 2004 23:41 schrieb Alan Stern:
> > barriers. Actually, it's worse, you need a full mb() to order them,
> > which is why lately, we made ppc64 writeX() do full sync's ... that sucks
> > but it's near to impossible to get an abstract IO API that would cover
> > our needs here and still make other archs happy it seems...
>
> I recently changed a few mb() calls to wmb(), because they only protected
> data the CPU was writing to be read by the device.  Do you think changing
> all the wmb()'s back to mb()'s would make a difference?

Are these issues documented somewhere?

	Regards
		Oliver

** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

  parent reply	other threads:[~2004-06-19  6:53 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <40CDC05B.9020708@bplan-gmbh.de>
     [not found] ` <1087241757.5996.3.camel@localhost.localdomain>
     [not found]   ` <20040617173454.GA5971@pegasos>
2004-06-18 10:20     ` [linux-usb-devel] [Patch] for UHCI driver (from kernel 2.6.6) Sven Luther
2004-06-18 21:31       ` Benjamin Herrenschmidt
2004-06-18 21:41         ` Alan Stern
2004-06-18 21:43           ` Benjamin Herrenschmidt
2004-06-19 13:59             ` Alan Stern
2004-06-19 14:16               ` Sven Luther
2004-06-21  8:18                 ` Segher Boessenkool
2004-06-21  8:57                   ` Sven Luther
2004-06-19  6:53           ` Oliver Neukum [this message]
     [not found] <40CE2E24.5060207@pacbell.net>
2004-06-15 16:35 ` [linux-usb-devel] Patch " Alan Stern
2004-06-15 17:08   ` David Brownell
2004-06-15 17:23     ` Duncan Sands
2004-06-15 19:35     ` Alan Stern
2004-06-15 20:33       ` David Brownell
2004-06-15 21:12         ` Alan Stern
2004-06-15 21:40   ` Guennadi Liakhovetski

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