From: Michael Buesch <mb@bu3sch.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
John Linville <linville@tuxdriver.com>,
Andi Kleen <andi@firstfloor.org>,
David Miller <davem@davemloft.net>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Ingo Molnar <mingo@elte.hu>,
bcm43xx-dev@lists.berlios.de, linux-wireless@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/3] Add API for weak DMA masks
Date: Thu, 1 May 2008 17:47:26 +0200 [thread overview]
Message-ID: <200805011747.27469.mb@bu3sch.de> (raw)
In-Reply-To: <20080501154358.GA3318@infradead.org>
On Thursday 01 May 2008 17:43:58 Christoph Hellwig wrote:
> On Thu, May 01, 2008 at 05:42:04PM +0200, Michael Buesch wrote:
> > Yeah. because it has to be done in every driver.
> > So we put the implementation into a central place, instead of
> > reimplementing the wheel over and over again. This way we avoid bugs,
> > like the "b43 broken on VIA boards" in the first place.
> > Currently every driver requesting a >32bit mask and not retrying with
> > a lower mask is broken on VIA hardware. I dunno how many of the current
> > drivers that are, but everybody can easily see that is not a b43-specific
> > problem that we should solve for b43 only.
>
> Yeah. Personally I'd rather let set_dma_mask fall back silently,
We've discussed that and this behaviour is not acceptable, as the driver
must know about a possible fallback in case it can do 32bit DMA
more efficiently than 64bit DMA, for example.
So here we go. People rejected that approach, that I also suggested.
Here's what people want.
--
Greetings Michael.
next prev parent reply other threads:[~2008-05-01 15:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-01 14:38 [PATCH 0/3] Add API for weak DMA masks Michael Buesch
2008-05-01 9:00 ` Arjan van de Ven
2008-05-01 14:40 ` [PATCH 1/3] Add dma_set_mask_weak() API Michael Buesch
2008-05-01 16:20 ` Alan Cox
2008-05-01 17:11 ` Michael Buesch
2008-05-01 14:41 ` [PATCH 2/3] ssb: Add weak DMA-mask API Michael Buesch
2008-05-01 14:43 ` [PATCH 3/3] b43: Use the new " Michael Buesch
2008-05-01 15:36 ` [PATCH 0/3] Add API for weak DMA masks Christoph Hellwig
2008-05-01 15:42 ` Michael Buesch
2008-05-01 15:43 ` Christoph Hellwig
2008-05-01 15:47 ` Michael Buesch [this message]
2008-05-01 15:58 ` Christoph Hellwig
2008-05-01 16:07 ` Michael Buesch
2008-05-01 16:30 ` Jesse Barnes
2008-05-01 17:16 ` Michael Buesch
2008-05-01 17:22 ` Jesse Barnes
2008-05-01 17:25 ` Michael Buesch
2008-05-01 17:27 ` Jesse Barnes
2008-05-01 17:33 ` Michael Buesch
2008-05-01 16:29 ` Alan Cox
2008-05-01 21:39 ` David Miller
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