remove dma_supported and pci_dma_supported as public APIs

@@ -890,7 +890,7 @@ static int snd_cx88_create(struct snd_card *card, struct pci_dev *pci,
 		return err;
 	}
 
-	if (!pci_dma_supported(pci,DMA_BIT_MASK(32))) {
+	if (!pci_set_dma_mask(pci,DMA_BIT_MASK(32))) {
 		dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n",core->name);
 		err = -EIO;
 		cx88_core_put(core, pci);

@@ -393,7 +393,7 @@ static int cx8802_init_common(struct cx8802_dev *dev)
 	if (pci_enable_device(dev->pci))
 		return -EIO;
 	pci_set_master(dev->pci);
-	if (!pci_dma_supported(dev->pci,DMA_BIT_MASK(32))) {
+	if (!pci_set_dma_mask(dev->pci,DMA_BIT_MASK(32))) {
 		printk("%s/2: Oops: no 32bit PCI DMA ???\n",dev->core->name);
 		return -EIO;
 	}

@@ -1311,7 +1311,7 @@ static int cx8800_initdev(struct pci_dev *pci_dev,
 	       dev->pci_lat,(unsigned long long)pci_resource_start(pci_dev,0));
 
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev,DMA_BIT_MASK(32))) {
+	if (!pci_set_dma_mask(pci_dev,DMA_BIT_MASK(32))) {
 		printk("%s/0: Oops: no 32bit PCI DMA ???\n",core->name);
 		err = -EIO;
 		goto fail_core;

@@ -949,7 +949,7 @@ static int saa7134_initdev(struct pci_dev *pci_dev,
 	       pci_name(pci_dev), dev->pci_rev, pci_dev->irq,
 	       dev->pci_lat,(unsigned long long)pci_resource_start(pci_dev,0));
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev, DMA_BIT_MASK(32))) {
+	if (!pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32))) {
 		pr_warn("%s: Oops: no 32bit PCI DMA ???\n", dev->name);
 		err = -EIO;
 		goto fail1;

@@ -755,7 +755,7 @@ static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
 		pi->port.line);
 
 	if (!pi->dma_region) {
-		if (!dma_supported(pi->port.dev, 0xffffffff)) {
+		if (!dma_set_mask(pi->port.dev, 0xffffffff)) {
 			printk(KERN_ERR "MPSC: Inadequate DMA support\n");
 			rc = -ENXIO;
 		} else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,

@@ -1990,7 +1990,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev,
 		(unsigned long long)pci_resource_start(pci_dev, 0));
 
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev, 0xffffffff)) {
+	if (!pci_set_dma_mask(pci_dev, 0xffffffff)) {
 		printk("%s/0: Oops: no 32bit PCI DMA ???\n", dev->name);
 		err = -EIO;
 		goto fail_context;

@@ -350,11 +350,14 @@ nouveau_ttm_init(struct nouveau_drm *drm)
 
 	bits = nvxx_mmu(&drm->device)->dma_bits;
 	if (nvxx_device(&drm->device)->func->pci) {
-		if (drm->agp.bridge ||
-		     !pci_dma_supported(dev->pdev, DMA_BIT_MASK(bits)))
+		if (drm->agp.bridge)
 			bits = 32;
 
 		ret = pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(bits));
+		if (ret && bits != 32) {
+			bits = 32;
+			ret = pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(bits));
+		}
 		if (ret)
 			return ret;
 

@@ -1661,12 +1661,6 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
 	 * bind() should set rx_urb_size in that case.
 	 */
 	dev->hard_mtu = net->mtu + net->hard_header_len;
-#if 0
-// dma_supported() is deeply broken on almost all architectures
-	// possible with some EHCI controllers
-	if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
-		net->features |= NETIF_F_HIGHDMA;
-#endif
 
 	net->netdev_ops = &usbnet_netdev_ops;
 	net->watchdog_timeo = TX_TIMEOUT_JIFFIES;

@@ -704,8 +704,6 @@ ccio_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
  * ccio_dma_supported - Verify the IOMMU supports the DMA address range.
  * @dev: The PCI device.
  * @mask: A bit mask describing the DMA address range of the device.
- *
- * This function implements the pci_dma_supported function.
  */
 static int 
 ccio_dma_supported(struct device *dev, u64 mask)

@@ -6,12 +6,6 @@
 
 #include <linux/dma-mapping.h>
 
-static inline int
-pci_dma_supported(struct pci_dev *hwdev, u64 mask)
-{
-	return dma_supported(hwdev == NULL ? NULL : &hwdev->dev, mask);
-}
-
 static inline void *
 pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
 		     dma_addr_t *dma_handle)

@@ -142,19 +142,6 @@ Part Ic - DMA addressing limitations
 ------------------------------------
 
 int
-dma_supported(struct device *dev, u64 mask)
-
-Checks to see if the device can support DMA to the memory described by
-mask.
-
-Returns: 1 if it can and 0 if it can't.
-
-Notes: This routine merely tests to see if the mask is possible.  It
-won't change the current mask settings.  It is more intended as an
-internal API for use by the platform than an external API for use by
-driver writers.
-
-int
 dma_set_mask_and_coherent(struct device *dev, u64 mask)
 
 Checks to see if the mask is possible and updates the device

@@ -589,7 +589,7 @@ static int ehci_run (struct usb_hcd *hcd)
 	 * streaming mappings for I/O buffers, like pci_map_single(),
 	 * can return segments above 4GB, if the device allows.
 	 *
-	 * NOTE:  the dma mask is visible through dma_supported(), so
+	 * NOTE:  the dma mask is visible through dev->dma_mask, so
 	 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 	 * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 	 * host side drivers though.

@@ -5258,7 +5258,7 @@ static int fotg210_run(struct usb_hcd *hcd)
 	 * streaming mappings for I/O buffers, like pci_map_single(),
 	 * can return segments above 4GB, if the device allows.
 	 *
-	 * NOTE:  the dma mask is visible through dma_supported(), so
+	 * NOTE:  the dma mask is visible through dev->dma_mask, so
 	 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 	 * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 	 * host side drivers though.

@@ -5181,7 +5181,7 @@ static int fusbh200_run (struct usb_hcd *hcd)
 	 * streaming mappings for I/O buffers, like pci_map_single(),
 	 * can return segments above 4GB, if the device allows.
 	 *
-	 * NOTE:  the dma mask is visible through dma_supported(), so
+	 * NOTE:  the dma mask is visible through dev->dma_mask, so
 	 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 	 * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 	 * host side drivers though.

@@ -2721,7 +2721,7 @@ static int oxu_run(struct usb_hcd *hcd)
 	 * streaming mappings for I/O buffers, like pci_map_single(),
 	 * can return segments above 4GB, if the device allows.
 	 *
-	 * NOTE:  the dma mask is visible through dma_supported(), so
+	 * NOTE:  the dma mask is visible through dev->dma_mask, so
 	 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
 	 * Scsi_Host.highmem_io, and so forth.  It's readonly to all
 	 * host side drivers though.

@@ -1177,12 +1177,6 @@ err_fw:
 	INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
 	usb_set_intfdata(intf, kaweth);
 
-#if 0
-// dma_supported() is deeply broken on almost all architectures
-	if (dma_supported (dev, 0xffffffffffffffffULL))
-		kaweth->net->features |= NETIF_F_HIGHDMA;
-#endif
-
 	SET_NETDEV_DEV(netdev, dev);
 	if (register_netdev(netdev) != 0) {
 		dev_err(dev, "Error registering netdev.\n");

@@ -1247,11 +1247,9 @@ static int efx_init_io(struct efx_nic *efx)
 	 * masks event though they reject 46 bit masks.
 	 */
 	while (dma_mask > 0x7fffffffUL) {
-		if (dma_supported(&pci_dev->dev, dma_mask)) {
-			rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
-			if (rc == 0)
-				break;
-		}
+		rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
+		if (rc == 0)
+			break;
 		dma_mask >>= 1;
 	}
 	if (rc) {

@@ -809,7 +809,7 @@ static int netup_unidvb_initdev(struct pci_dev *pci_dev,
 		"%s(): board vendor 0x%x, revision 0x%x\n",
 		__func__, board_vendor, board_revision);
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev, 0xffffffff)) {
+	if (!pci_set_dma_mask(pci_dev, 0xffffffff)) {
 		dev_err(&pci_dev->dev,
 			"%s(): 32bit PCI DMA is not supported\n", __func__);
 		goto pci_detect_err;

@@ -1319,7 +1319,7 @@ static int cx25821_initdev(struct pci_dev *pci_dev,
 		dev->pci_lat, (unsigned long long)dev->base_io_addr);
 
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev, 0xffffffff)) {
+	if (!pci_set_dma_mask(pci_dev, 0xffffffff)) {
 		pr_err("%s/0: Oops: no 32bit PCI DMA ???\n", dev->name);
 		err = -EIO;
 		goto fail_irq;

@@ -1264,7 +1264,7 @@ static int saa7164_initdev(struct pci_dev *pci_dev,
 
 	pci_set_master(pci_dev);
 	/* TODO */
-	if (!pci_dma_supported(pci_dev, 0xffffffff)) {
+	if (!pci_set_dma_mask(pci_dev, 0xffffffff)) {
 		printk("%s/0: Oops: no 32bit PCI DMA ???\n", dev->name);
 		err = -EIO;
 		goto fail_irq;

@@ -257,7 +257,7 @@ static int tw68_initdev(struct pci_dev *pci_dev,
 		dev->name, pci_name(pci_dev), dev->pci_rev, pci_dev->irq,
 		dev->pci_lat, (u64)pci_resource_start(pci_dev, 0));
 	pci_set_master(pci_dev);
-	if (!pci_dma_supported(pci_dev, DMA_BIT_MASK(32))) {
+	if (!pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32))) {
 		pr_info("%s: Oops: no 32bit PCI DMA ???\n", dev->name);
 		err = -EIO;
 		goto fail1;

@@ -1500,7 +1500,7 @@ pcnet32_probe_pci(struct pci_dev *pdev, const struct pci_device_id *ent)
 		return -ENODEV;
 	}
 
-	if (!pci_dma_supported(pdev, PCNET32_DMA_MASK)) {
+	if (!pci_set_dma_mask(pdev, PCNET32_DMA_MASK)) {
 		if (pcnet32_debug & NETIF_MSG_PROBE)
 			pr_err("architecture does not support 32bit PCI busmaster DMA\n");
 		return -ENODEV;