From: Ian Jackson <ian.jackson@eu.citrix.com>
Date: Tue, 28 Jun 2011 12:49:35 +0000 (+0100)
Subject: passthrough: mask out upper bits in vendor id
X-Git-Tag: xen-4.2.0-rc1~39
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=5c5295c807583e3cc29fafb3603a8b89dc83edac;p=qemu-xen-4.3-testing.git

passthrough: mask out upper bits in vendor id

Making vendor_id u16 eliminates potential bogus upper bits that are
not part of the actual 16-bit vendor ID.  On some systems, upper bits
shows up with 0xffff.

Signed-off-by: Allen Kay <allen.m.kay@intel.com>
---

diff --git a/hw/pt-graphics.c b/hw/pt-graphics.c
index d44492101..889772d99 100644
--- a/hw/pt-graphics.c
+++ b/hw/pt-graphics.c
@@ -94,7 +94,8 @@ uint32_t igd_pci_read(PCIDevice *pci_dev, uint32_t config_addr, int len)
  */
 int register_vga_regions(struct pt_dev *real_device)
 {
-    u32 vendor_id, igd_opregion;
+    u16 vendor_id;
+    int igd_opregion;
     int ret = 0;
 
     if ( !gfx_passthru || real_device->pci_dev->device_class != 0x0300 )