Usnure that PCI bus BIS_GET_DMA_TAG() method sees the actual PCI

device which makes the request for dma tag, instead of some descendant
of the PCI device, by creating a pass-through trampoline for vga_pci
and ata_pci buses.

Sponsored by:	The FreeBSD Foundation
Suggested by:	jhb
Discussed with:	jhb, mav
MFC after:	1 week

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/ata/ata-pci.c b/sys/dev/ata/ata-pci.c
index b3cf726..0f7e8af 100644
--- a/sys/dev/ata/ata-pci.c
+++ b/sys/dev/ata/ata-pci.c
@@ -571,6 +571,13 @@ ata_pci_child_location_str(device_t dev, device_t child, char *buf,
 	return (0);
 }
 
+static bus_dma_tag_t
+ata_pci_get_dma_tag(device_t bus, device_t child)
+{
+
+	return (bus_get_dma_tag(bus));
+}
+
 static device_method_t ata_pci_methods[] = {
     /* device interface */
     DEVMETHOD(device_probe,             ata_pci_probe),
@@ -593,6 +600,7 @@ static device_method_t ata_pci_methods[] = {
     DEVMETHOD(pci_write_config,		ata_pci_write_config),
     DEVMETHOD(bus_print_child,		ata_pci_print_child),
     DEVMETHOD(bus_child_location_str,	ata_pci_child_location_str),
+    DEVMETHOD(bus_get_dma_tag,		ata_pci_get_dma_tag),
 
     DEVMETHOD_END
 };