linux-kernel - [tip:x86/efi] x86, efi: Ensure that the entirity of a region is mapped

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Message-ID: <tip-935a638241b0658b9749edd060f972575f9d4a78@git.kernel.org>
Date:	Mon, 9 May 2011 23:18:03 GMT
From:	tip-bot for Matthew Garrett <mjg@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mjg@...hat.com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/efi] x86, efi: Ensure that the entirity of a region is mapped

Commit-ID:  935a638241b0658b9749edd060f972575f9d4a78
Gitweb:     http://git.kernel.org/tip/935a638241b0658b9749edd060f972575f9d4a78
Author:     Matthew Garrett <mjg@...hat.com>
AuthorDate: Thu, 5 May 2011 15:19:46 -0400
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Mon, 9 May 2011 12:14:45 -0700

x86, 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>
Link: http://lkml.kernel.org/r/1304623186-18261-5-git-send-email-mjg@redhat.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.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);
 }
--
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