usb: don't inherity DMA properties for USB devices

[Christoph Hellwig]

As the comment in usb_alloc_dev correctly states, drivers can't use
the DMA API on usb device, and at least calling dma_set_mask on them
is highly dangerous.  Unlike what the comment states upper level drivers
also can't really use the presence of a dma mask to check for DMA
support, as the dma_mask is set by default for most busses.

Remove the copying over of DMA information, and remove the now unused
dma_direct_copy_range_map export.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/usb/core/message.c |  7 -------
 drivers/usb/core/usb.c     | 13 -------------
 kernel/dma/direct.c        |  1 -
 3 files changed, 21 deletions(-)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 935ee98e049f65..9e45732dc1d1d1 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1954,13 +1954,6 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 		intf->dev.bus = &usb_bus_type;
 		intf->dev.type = &usb_if_device_type;
 		intf->dev.groups = usb_interface_groups;
-		/*
-		 * Please refer to usb_alloc_dev() to see why we set
-		 * dma_mask and dma_range_map.
-		 */
-		intf->dev.dma_mask = dev->dev.dma_mask;
-		if (dma_direct_copy_range_map(&intf->dev, &dev->dev))
-			dev_err(&dev->dev, "failed to copy DMA map\n");
 		INIT_WORK(&intf->reset_ws, __usb_queue_reset_device);
 		intf->minor = -1;
 		device_initialize(&intf->dev);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 23d451f6894d70..9b4ac4415f1a47 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -599,19 +599,6 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 	dev->dev.bus = &usb_bus_type;
 	dev->dev.type = &usb_device_type;
 	dev->dev.groups = usb_device_groups;
-	/*
-	 * Fake a dma_mask/offset for the USB device:
-	 * We cannot really use the dma-mapping API (dma_alloc_* and
-	 * dma_map_*) for USB devices but instead need to use
-	 * usb_alloc_coherent and pass data in 'urb's, but some subsystems
-	 * manually look into the mask/offset pair to determine whether
-	 * they need bounce buffers.
-	 * Note: calling dma_set_mask() on a USB device would set the
-	 * mask for the entire HCD, so don't do that.
-	 */
-	dev->dev.dma_mask = bus->sysdev->dma_mask;
-	if (dma_direct_copy_range_map(&dev->dev, bus->sysdev))
-		dev_err(&dev->dev, "failed to copy DMA map\n");
 	set_dev_node(&dev->dev, dev_to_node(bus->sysdev));
 	dev->state = USB_STATE_ATTACHED;
 	dev->lpm_disable_count = 1;
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index fc815f7375e282..3af257571a3b42 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -552,4 +552,3 @@ int dma_direct_copy_range_map(struct device *to, struct device *from)
 	to->dma_range_map = new_map;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(dma_direct_copy_range_map);
-- 
2.28.0