linux-kernel - [PATCH] Fix MSI-X with NIU cards

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Date:	Fri, 8 May 2009 07:13:33 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	"David S. Miller" <davem@...emloft.net>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix MSI-X with NIU cards


The NIU device refuses to allow accesses to MSI-X registers before MSI-X
is enabled.  This patch fixes the problem by moving the read of the mask
register to after MSI-X is enabled.

Reported-by: David S. Miller <davem@...emloft.net>
Tested-by: David S. Miller <davem@...emloft.net>
Reviewed-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6f2e629..3627732 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -455,8 +455,6 @@ static int msix_capability_init(struct pci_dev *dev,
 		entry->msi_attrib.default_irq = dev->irq;
 		entry->msi_attrib.pos = pos;
 		entry->mask_base = base;
-		entry->masked = readl(base + j * PCI_MSIX_ENTRY_SIZE +
-					PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
 		msix_mask_irq(entry, 1);
 
 		list_add_tail(&entry->list, &dev->msi_list);
@@ -493,6 +491,12 @@ static int msix_capability_init(struct pci_dev *dev,
 	msix_set_enable(dev, 1);
 	dev->msix_enabled = 1;
 
+	list_for_each_entry(entry, &dev->msi_list, list) {
+		int vector = entry->msi_attrib.entry_nr;
+		entry->masked = readl(base + vector * PCI_MSIX_ENTRY_SIZE +
+					PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
+	}
+
 	return 0;
 }
 

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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