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Commit 5e60a161 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: avoid using urb->pipe in usbcore 



This patch (as946) eliminates many of the uses of urb->pipe in
usbcore.  Unfortunately there will have to be a significant API
change, affecting all USB drivers, before we can remove it entirely.
This patch contents itself with changing only the interface to
usb_buffer_map_sg() and friends: The pipe argument is replaced with a
direction flag.  That can be done easily because those routines get
used in only one place.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent fea34091

drivers/usb/core/hcd.c

+24 −16
Original line number Diff line number Diff line
@@ -635,9 +635,9 @@ static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb) 


static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)

{

	if (usb_pipeint (urb->pipe))

	if (usb_endpoint_xfer_int(&urb->ep->desc))

		return rh_queue_status (hcd, urb);

	if (usb_pipecontrol (urb->pipe))

	if (usb_endpoint_xfer_control(&urb->ep->desc))

		return rh_call_control (hcd, urb);

	return -EINVAL;

}
@@ -651,7 +651,7 @@ static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb) 
{

	unsigned long	flags;



	if (usb_pipeendpoint(urb->pipe) == 0) {	/* Control URB */

	if (usb_endpoint_num(&urb->ep->desc) == 0) {	/* Control URB */

		;	/* Do nothing */



	} else {				/* Status URB */
@@ -918,7 +918,7 @@ static void urb_unlink(struct usb_hcd *hcd, struct urb *urb) 
	spin_unlock_irqrestore(&hcd_urb_list_lock, flags);



	if (hcd->self.uses_dma && !is_root_hub(urb->dev)) {

		if (usb_pipecontrol (urb->pipe)

		if (usb_endpoint_xfer_control(&urb->ep->desc)

			&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))

			dma_unmap_single (hcd->self.controller, urb->setup_dma,

					sizeof (struct usb_ctrlrequest),
@@ -1001,7 +1001,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags) 
	 * unless it uses pio or talks to another transport.

	 */

	if (hcd->self.uses_dma) {

		if (usb_pipecontrol (urb->pipe)

		if (usb_endpoint_xfer_control(&urb->ep->desc)

			&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))

			urb->setup_dma = dma_map_single (

					hcd->self.controller,
@@ -1201,11 +1201,13 @@ rescan: 
	spin_lock(&hcd_urb_list_lock);

	list_for_each_entry (urb, &ep->urb_list, urb_list) {

		int	tmp;

		int	is_in;



		/* the urb may already have been unlinked */

		if (urb->status != -EINPROGRESS)

			continue;

		usb_get_urb (urb);

		is_in = usb_urb_dir_in(urb);

		spin_unlock(&hcd_urb_list_lock);



		spin_lock (&urb->lock);
@@ -1216,19 +1218,25 @@ rescan: 


		/* kick hcd unless it's already returning this */

		if (tmp == -EINPROGRESS) {

			tmp = urb->pipe;

			unlink1 (hcd, urb);

			dev_dbg (hcd->self.controller,

				"shutdown urb %p pipe %08x ep%d%s%s\n",

				urb, tmp, usb_pipeendpoint (tmp),

				(tmp & USB_DIR_IN) ? "in" : "out",

				({ char *s; \

				 switch (usb_pipetype (tmp)) { \

				 case PIPE_CONTROL:	s = ""; break; \

				 case PIPE_BULK:	s = "-bulk"; break; \

				 case PIPE_INTERRUPT:	s = "-intr"; break; \

				 default: 		s = "-iso"; break; \

				}; s;}));

				"shutdown urb %p ep%d%s%s\n",

				urb, usb_endpoint_num(&ep->desc),

				is_in ? "in" : "out",

				({	char *s;



					switch (usb_endpoint_type(&ep->desc)) {

					case USB_ENDPOINT_XFER_CONTROL:

						s = ""; break;

					case USB_ENDPOINT_XFER_BULK:

						s = "-bulk"; break;

					case USB_ENDPOINT_XFER_INT:

						s = "-intr"; break;

					default:

				 		s = "-iso"; break;

					};

					s;

				}));

		}

		usb_put_urb (urb);

drivers/usb/core/message.c

+8 −6
Original line number Diff line number Diff line
@@ -59,8 +59,8 @@ static int usb_start_wait_urb(struct urb *urb, int timeout, int *actual_length) 
		dev_dbg(&urb->dev->dev,

			"%s timed out on ep%d%s len=%d/%d\n",

			current->comm,

			usb_pipeendpoint(urb->pipe),

			usb_pipein(urb->pipe) ? "in" : "out",

			usb_endpoint_num(&urb->ep->desc),

			usb_urb_dir_in(urb) ? "in" : "out",

			urb->actual_length,

			urb->transfer_buffer_length);

	} else
@@ -250,7 +250,8 @@ static void sg_clean (struct usb_sg_request *io) 
		io->urbs = NULL;

	}

	if (io->dev->dev.dma_mask != NULL)

		usb_buffer_unmap_sg (io->dev, io->pipe, io->sg, io->nents);

		usb_buffer_unmap_sg (io->dev, usb_pipein(io->pipe),

				io->sg, io->nents);

	io->dev = NULL;

}
@@ -278,8 +279,8 @@ static void sg_complete (struct urb *urb) 
		dev_err (io->dev->bus->controller,

			"dev %s ep%d%s scatterlist error %d/%d\n",

			io->dev->devpath,

			usb_pipeendpoint (urb->pipe),

			usb_pipein (urb->pipe) ? "in" : "out",

			usb_endpoint_num(&urb->ep->desc),

			usb_urb_dir_in(urb) ? "in" : "out",

			status, io->status);

		// BUG ();

	}
@@ -379,7 +380,8 @@ int usb_sg_init ( 
	 */

	dma = (dev->dev.dma_mask != NULL);

	if (dma)

		io->entries = usb_buffer_map_sg (dev, pipe, sg, nents);

		io->entries = usb_buffer_map_sg(dev, usb_pipein(pipe),

				sg, nents);

	else

		io->entries = nents;

drivers/usb/core/usb.c

+9 −10
Original line number Diff line number Diff line
@@ -748,7 +748,7 @@ void usb_buffer_unmap(struct urb *urb) 
/**

 * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint

 * @dev: device to which the scatterlist will be mapped

 * @pipe: endpoint defining the mapping direction

 * @is_in: mapping transfer direction

 * @sg: the scatterlist to map

 * @nents: the number of entries in the scatterlist

 *
@@ -771,14 +771,13 @@ void usb_buffer_unmap(struct urb *urb) 
 *

 * Reverse the effect of this call with usb_buffer_unmap_sg().

 */

int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe,

int usb_buffer_map_sg(const struct usb_device *dev, int is_in,

		      struct scatterlist *sg, int nents)

{

	struct usb_bus		*bus;

	struct device		*controller;



	if (!dev

			|| usb_pipecontrol(pipe)

			|| !(bus = dev->bus)

			|| !(controller = bus->controller)

			|| !controller->dma_mask)
@@ -786,7 +785,7 @@ int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe, 


	// FIXME generic api broken like pci, can't report errors

	return dma_map_sg(controller, sg, nents,

			usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

			is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

}



/* XXX DISABLED, no users currently.  If you wish to re-enable this
@@ -799,14 +798,14 @@ int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe, 
/**

 * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s)

 * @dev: device to which the scatterlist will be mapped

 * @pipe: endpoint defining the mapping direction

 * @is_in: mapping transfer direction

 * @sg: the scatterlist to synchronize

 * @n_hw_ents: the positive return value from usb_buffer_map_sg

 *

 * Use this when you are re-using a scatterlist's data buffers for

 * another USB request.

 */

void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe,

void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,

			   struct scatterlist *sg, int n_hw_ents)

{

	struct usb_bus		*bus;
@@ -819,20 +818,20 @@ void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe, 
		return;



	dma_sync_sg(controller, sg, n_hw_ents,

			usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

			is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

}

#endif



/**

 * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist

 * @dev: device to which the scatterlist will be mapped

 * @pipe: endpoint defining the mapping direction

 * @is_in: mapping transfer direction

 * @sg: the scatterlist to unmap

 * @n_hw_ents: the positive return value from usb_buffer_map_sg

 *

 * Reverses the effect of usb_buffer_map_sg().

 */

void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe,

void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,

			 struct scatterlist *sg, int n_hw_ents)

{

	struct usb_bus		*bus;
@@ -845,7 +844,7 @@ void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe, 
		return;



	dma_unmap_sg(controller, sg, n_hw_ents,

			usb_pipein(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

			is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);

}



/* format to disable USB on kernel command line is: nousb */

include/linux/usb.h

+3 −3
Original line number Diff line number Diff line
@@ -1422,13 +1422,13 @@ void usb_buffer_unmap (struct urb *urb); 
#endif



struct scatterlist;

int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe,

int usb_buffer_map_sg(const struct usb_device *dev, int is_in,

		      struct scatterlist *sg, int nents);

#if 0

void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe,

void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,

			   struct scatterlist *sg, int n_hw_ents);

#endif

void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe,

void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,

			 struct scatterlist *sg, int n_hw_ents);



/*-------------------------------------------------------------------*