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Commit 278edfc0 authored by Jan Beulich's avatar Jan Beulich Committed by David Vrabel
Browse files

xen-pciback: also support disabling of bus-mastering and memory-write-invalidate 



It's not clear to me why only the enabling operation got handled so
far.

Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 85617dc7

drivers/xen/xen-pciback/conf_space_header.c

+14 −1
Original line number Diff line number Diff line
@@ -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;