linux-kernel - [tip:x86/uv] x86, UV: system table in bios accessed after unmap

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Message-ID: <tip-1a544e659cbfce178395e9a090a47d1907d0cfa8@git.kernel.org>
Date:	Fri, 3 Apr 2009 17:33:32 GMT
From:	Russ Anderson <rja@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, rja@....com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/uv] x86, UV: system table in bios accessed after unmap

Commit-ID:  1a544e659cbfce178395e9a090a47d1907d0cfa8
Gitweb:     http://git.kernel.org/tip/1a544e659cbfce178395e9a090a47d1907d0cfa8
Author:     Russ Anderson <rja@....com>
AuthorDate: Mon, 30 Mar 2009 17:52:40 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 3 Apr 2009 19:25:57 +0200

x86, UV: system table in bios accessed after unmap

Use the copy of UV system table in kernel memory, not the one in
bios after unmapping.

Signed-off-by: Russ Anderson <rja@....com>
LKML-Reference: <20090330225240.GA22776@....com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/kernel/bios_uv.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/bios_uv.c b/arch/x86/kernel/bios_uv.c
index f638827..63a88e1 100644
--- a/arch/x86/kernel/bios_uv.c
+++ b/arch/x86/kernel/bios_uv.c
@@ -182,7 +182,8 @@ void uv_bios_init(void)
 	memcpy(&uv_systab, tab, sizeof(struct uv_systab));
 	iounmap(tab);
 
-	printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
+	printk(KERN_INFO "EFI UV System Table Revision %d\n",
+					uv_systab.revision);
 }
 #else	/* !CONFIG_EFI */
 
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