linux-kernel - [PATCH 3.4 02/92] PCI: Fix TI816X class code quirk

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Message-Id: <1460976397-5688-2-git-send-email-lizf@kernel.org>
Date:	Mon, 18 Apr 2016 18:45:07 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Hemant Pedanekar <hemantp@...com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 02/92] PCI: Fix TI816X class code quirk

From: Bjorn Helgaas <bhelgaas@...gle.com>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit d1541dc977d376406f4584d8eb055488655c98ec upstream.

In fixup_ti816x_class(), we assigned "class = PCI_CLASS_MULTIMEDIA_VIDEO".
But PCI_CLASS_MULTIMEDIA_VIDEO is only the two-byte base class/sub-class
and needs to be shifted to make space for the low-order interface byte.

Shift PCI_CLASS_MULTIMEDIA_VIDEO to set the correct class code.

Fixes: 63c4408074cb ("PCI: Add quirk for setting valid class for TI816X Endpoint")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Hemant Pedanekar <hemantp@...com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/pci/quirks.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index c030024..887af797 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2834,12 +2834,15 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x3c28, vtd_mask_spec_errors);
 
 static void __devinit fixup_ti816x_class(struct pci_dev* dev)
 {
+	u32 class = dev->class;
+
 	/* TI 816x devices do not have class code set when in PCIe boot mode */
-	dev_info(&dev->dev, "Setting PCI class for 816x PCIe device\n");
-	dev->class = PCI_CLASS_MULTIMEDIA_VIDEO;
+	dev->class = PCI_CLASS_MULTIMEDIA_VIDEO << 8;
+	dev_info(&dev->dev, "PCI class overridden (%#08x -> %#08x)\n",
+		 class, dev->class);
 }
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_TI, 0xb800,
-				 PCI_CLASS_NOT_DEFINED, 0, fixup_ti816x_class);
+			      PCI_CLASS_NOT_DEFINED, 0, fixup_ti816x_class);
 
 /* Some PCIe devices do not work reliably with the claimed maximum
  * payload size supported.
-- 
1.9.1