linux-kernel - [PATCH] Fix pci_unmap

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Message-Id: <1246469692.3681.1949.camel@macbook.infradead.org>
Date:	Wed, 01 Jul 2009 18:34:52 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	torvalds@...ux-foundation.org, x86 maintainers <x86@...nel.org>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH] Fix pci_unmap_addr() et al on i386.

We can run a 32-bit kernel on boxes with an IOMMU, so we need
pci_unmap_addr() etc. to work -- without it, drivers will leak mappings.

To be honest, this whole thing looks like it's more pain than it's
worth; I'm half inclined to remove the no-op #else case altogether.

But this is the minimal fix, which just does the right thing if
CONFIG_DMAR is set.

Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
---
Needed in 2.6.30, but not earlier because you can't enable CONFIG_DMAR
before that. Jörg, if you ever enable the AMD IOMMU in 32-bit mode you
may have to fix this again (unless we just make it unconditionally do
the right thing, which probably gets my vote).

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 927958d..1ff685c 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -91,7 +91,7 @@ extern void pci_iommu_alloc(void);
 
 #define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
 
-#if defined(CONFIG_X86_64) || defined(CONFIG_DMA_API_DEBUG)
+#if defined(CONFIG_X86_64) || defined(CONFIG_DMAR) || defined(CONFIG_DMA_API_DEBUG)
 
 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)       \
 	        dma_addr_t ADDR_NAME;

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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