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-rw-r--r--drivers/xen/xen-pciback/conf_space_header.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-pciback/conf_space_header.c
index 2d7369391472..c2260a0456c9 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -88,9 +88,15 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
pci_name(dev));
pci_set_master(dev);
+ } else if (dev->is_busmaster && !is_master_cmd(value)) {
+ if (unlikely(verbose_request))
+ printk(KERN_DEBUG DRV_NAME ": %s: clear bus master\n",
+ pci_name(dev));
+ pci_clear_master(dev);
}
- if (value & PCI_COMMAND_INVALIDATE) {
+ if (!(cmd->val & PCI_COMMAND_INVALIDATE) &&
+ (value & PCI_COMMAND_INVALIDATE)) {
if (unlikely(verbose_request))
printk(KERN_DEBUG
DRV_NAME ": %s: enable memory-write-invalidate\n",
@@ -101,6 +107,13 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
pci_name(dev), err);
value &= ~PCI_COMMAND_INVALIDATE;
}
+ } else if ((cmd->val & PCI_COMMAND_INVALIDATE) &&
+ !(value & PCI_COMMAND_INVALIDATE)) {
+ if (unlikely(verbose_request))
+ printk(KERN_DEBUG
+ DRV_NAME ": %s: disable memory-write-invalidate\n",
+ pci_name(dev));
+ pci_clear_mwi(dev);
}
cmd->val = value;