linux-kernel - Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

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Message-ID: <20070611094638.GA18008@araj-amd64.jf.intel.com>
Date:	Mon, 11 Jun 2007 02:46:39 -0700
From:	Ashok Raj <ashok.raj@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	Andi Kleen <ak@...e.de>, Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	arjan@...ux.intel.com, ashok.raj@...el.com, shaohua.li@...el.com,
	davem@...emloft.net
Subject: Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

On Mon, Jun 11, 2007 at 02:14:49PM -0700, Andrew Morton wrote:
> > 
> > Again, if dma_map_{single|sg} API's fails due to 
> > failure to allocate memory, the only thing that can
> > be done is to panic as this is what few of the other 
> > IOMMU implementation is doing today. 
> 
> If the only option is to panic then something's busted.  If it's network IO
> then there should be a way of dropping the frame.  If it's disk IO then we
> should report the failure and cause an IO error.

Just looking at the code.. appears that quite a few popular ones (or should say most) dont even look at the dma_addr_t returned to check for failure.

Thats going to be another major cleanup work.
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