linux-kernel - [PATCH 5/5] efi: Ensure that the entirity of a region is mapped

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Date:	Thu,  5 May 2011 15:19:46 -0400
From:	Matthew Garrett <mjg@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, Matthew Garrett <mjg@...hat.com>
Subject: [PATCH 5/5] efi: Ensure that the entirity of a region is mapped

It's possible for init_memory_mapping() to fail to map the entire region
if it crosses a boundary, so ensure that we complete the mapping.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
---
 arch/x86/platform/efi/efi_64.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 94d6b39..2649426 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -89,8 +89,10 @@ void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
 		return ioremap(phys_addr, size);
 
 	last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
-	if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size)
-		return NULL;
+	if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
+		unsigned long top = last_map_pfn << PAGE_SHIFT;
+		efi_ioremap(top, size - (top - phys_addr), type);
+	}
 
 	return (void __iomem *)__va(phys_addr);
 }
-- 
1.7.5

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