From: Roland Dreier <rdreier@cisco.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: akepner@sgi.com, Tony Luck <tony.luck@intel.com>,
Grant Grundler <grundler@parisc-linux.org>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
Jes Sorensen <jes@sgi.com>,
Randy Dunlap <randy.dunlap@oracle.com>,
James Bottomley <James.Bottomley@steeleye.com>,
David Miller <davem@davemloft.net>,
Muli Ben-Yehuda <muli@il.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_* routines
Date: Tue, 08 Jan 2008 09:55:24 -0800 [thread overview]
Message-ID: <ada1w8skxrn.fsf@cisco.com> (raw)
In-Reply-To: <20080108175054.GA25168@infradead.org> (Christoph Hellwig's message of "Tue, 8 Jan 2008 17:50:54 +0000")
> Onething I've missed with these patches is drivers actually using
> it. What driver actually needs it and why don't you send patches
> for them?
In previous patch series, Arthur sent fixes for the mthca IB driver.
Other IB drivers like mlx4 also need this on Altix systems. Basically
anything where the device DMAs some data into userspace and then DMAs
a "completed" status to another buffer in userspace leads to a problem
where the "completed" DMA might pass the actual data in the Altix
fabric, which leads to the userspace process working with bogus data.
- R.
next prev parent reply other threads:[~2008-01-08 17:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 2:32 [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_* routines akepner
2008-01-08 16:27 ` James Bottomley
2008-01-08 17:42 ` Roland Dreier
2008-01-08 17:54 ` James Bottomley
2008-01-08 18:05 ` Roland Dreier
2008-01-08 18:21 ` James Bottomley
2008-01-09 0:55 ` akepner
2008-01-09 21:00 ` Roland Dreier
2008-01-09 21:05 ` akepner
2008-01-09 21:30 ` James Bottomley
2008-01-11 18:20 ` Grant Grundler
2008-01-08 18:13 ` akepner
2008-01-08 17:50 ` Christoph Hellwig
2008-01-08 17:55 ` Roland Dreier [this message]
2008-01-08 18:23 ` akepner
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