linux-kernel - [GIT PULL] One additional x86 fix for 2.6.34

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Date:	Fri, 14 May 2010 22:32:55 GMT
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Petr Vandrovec <petr@...drovec.name>,
	Jacob Pan <jacob.jun.pan@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] One additional x86 fix for 2.6.34

Hi Linus,

One additional fix for the 2.6.34 tree.  It missed my push from
earlier today because I was waiting for confirmation from the original
reporter that it indeed solves the problem.

The following changes since commit 7f284d3cc96e02468a42e045f77af11e5ff8b095:
  Frank Arnold (1):
        x86, cacheinfo: Turn off L3 cache index disable feature in virtualized environments

are available in the git repository at:

  ssh://master.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-fixes-for-linus

H. Peter Anvin (1):
      x86, mrst: Don't blindly access extended config space

 arch/x86/pci/mrst.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

commit e9b1d5d0ff4d3ae86050dc4c91b3147361c7af9e
Author: H. Peter Anvin <hpa@...ux.intel.com>
Date:   Fri May 14 13:55:57 2010 -0700

    x86, mrst: Don't blindly access extended config space
    
    Do not blindly access extended configuration space unless we actively
    know we're on a Moorestown platform.  The fixed-size BAR capability
    lives in the extended configuration space, and thus is not applicable
    if the configuration space isn't appropriately sized.
    
    This fixes booting certain VMware configurations with CONFIG_MRST=y.
    
    Moorestown will add a fake PCI-X 266 capability to advertise the
    presence of extended configuration space.
    
    Reported-and-tested-by: Petr Vandrovec <petr@...drovec.name>
    Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
    Acked-by: Jacob Pan <jacob.jun.pan@...el.com>
    Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
    LKML-Reference: <AANLkTiltKUa3TrKR1M51eGw8FLNoQJSLT0k0_K5X3-OJ@...l.gmail.com>

diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
index 8bf2fcb..1cdc02c 100644
--- a/arch/x86/pci/mrst.c
+++ b/arch/x86/pci/mrst.c
@@ -247,6 +247,10 @@ static void __devinit pci_fixed_bar_fixup(struct pci_dev *dev)
 	u32 size;
 	int i;
 
+	/* Must have extended configuration space */
+	if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
+		return;
+
 	/* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
 	offset = fixed_bar_cap(dev->bus, dev->devfn);
 	if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||
--
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