linux-kernel - Re: [PATCH] ia64: fix SBA IOMMU to handle allocation failure properly

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Date:	Wed, 21 Oct 2009 07:29:17 -0600
From:	"Leonardo Chiquitto" <lchiquitto@...ell.com>
To:	<tony.luck@...el.com>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	<linux-ia64@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ia64: fix SBA IOMMU to handle allocation failure
	 properly

> This is an updated patch of the patch that I've posted one year
> ago. Shehjar reported the problem and confirmed that the patch fixes
> it:
> 
> http://lkml.indiana.edu/hypermail/linux/kernel/0811.0/01562.html
> 
> Leonardo told me that he hit the same problem and confirmed that the
> patch fixes it.
> 
> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] ia64: fix SBA IOMMU to handle allocation failure properly
> 
> It's possible that SBA IOMMU might fail to find I/O space under heavy
> I/Os. SBA IOMMU panics on allocation failure but it shouldn't; drivers
> can handle the failure. The majority of other IOMMU drivers don't
> panic on allocation failure.
> 
> This patch fixes SBA IOMMU path to handle allocation failure properly.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

Thanks for refreshing and resubmitting this. I just received feedback
confirming that the patch resolves the problem.

Kind regards,
Leonardo

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