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USB: add ep->enable 

This patch (as944) adds an explicit "enabled" field to the
usb_host_endpoint structure and uses it in place of the current
mechanism.  This is merely a time-space tradeoff; it makes checking
whether URBs may be submitted to an endpoint simpler.  The existing
mechanism is efficient when converting urb->pipe to an endpoint
pointer, but it's not so efficient when urb->ep is used instead.

As a side effect, the procedure for enabling an endpoint is now a
little more complicated.  The ad-hoc inline code in usb.c and hub.c
for enabling ep0 is now replaced with calls to usb_enable_endpoint,
which is no longer static.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-07-30 17:05:22 -04:00 committed by Greg Kroah-Hartman
parent 5b653c79c0
commit bdd016ba64
6 changed files with 17 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/usb/core/hcd.c
View File

@ -943,7 +943,6 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
{
int status;
struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
struct usb_host_endpoint *ep;
unsigned long flags;
if (!hcd)
@ -960,9 +959,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
// FIXME: verify that quiescing hc works right (RH cleans up)
spin_lock_irqsave(&hcd_urb_list_lock, flags);
ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
[usb_pipeendpoint(urb->pipe)];
if (unlikely(ep != urb->ep))
if (unlikely(!urb->ep->enabled))
status = -ENOENT;
else if (unlikely (urb->reject))
status = -EPERM;

2
drivers/usb/core/hub.c
View File

@ -1999,7 +1999,7 @@ static void ep0_reinit(struct usb_device *udev)
{
usb_disable_endpoint(udev, 0 + USB_DIR_IN);
usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
usb_enable_endpoint(udev, &udev->ep0);
}
#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)

20
drivers/usb/core/message.c
View File

@ -1013,8 +1013,10 @@ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr)
ep = dev->ep_in[epnum];
dev->ep_in[epnum] = NULL;
}
if (ep && dev->bus)
if (ep) {
ep->enabled = 0;
usb_hcd_endpoint_disable(dev, ep);
}
}
/**
@ -1096,23 +1098,21 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
* Resets the endpoint toggle, and sets dev->ep_{in,out} pointers.
* For control endpoints, both the input and output sides are handled.
*/
static void
usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep)
void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep)
{
unsigned int epaddr = ep->desc.bEndpointAddress;
unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
int is_control;
int epnum = usb_endpoint_num(&ep->desc);
int is_out = usb_endpoint_dir_out(&ep->desc);
int is_control = usb_endpoint_xfer_control(&ep->desc);
is_control = ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_CONTROL);
if (usb_endpoint_out(epaddr) || is_control) {
if (is_out || is_control) {
usb_settoggle(dev, epnum, 1, 0);
dev->ep_out[epnum] = ep;
}
if (!usb_endpoint_out(epaddr) || is_control) {
if (!is_out || is_control) {
usb_settoggle(dev, epnum, 0, 0);
dev->ep_in[epnum] = ep;
}
ep->enabled = 1;
}
/*

2
drivers/usb/core/usb.c
View File

@ -260,7 +260,7 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1)
dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
/* ep0 maxpacket comes later, from device descriptor */
dev->ep_in[0] = dev->ep_out[0] = &dev->ep0;
usb_enable_endpoint(dev, &dev->ep0);
/* Save readable and stable topology id, distinguishing devices
* by location for diagnostics, tools, driver model, etc. The

2
drivers/usb/core/usb.h
View File

@ -8,6 +8,8 @@ extern int usb_create_ep_files(struct device *parent, struct usb_host_endpoint *
struct usb_device *udev);
extern void usb_remove_ep_files(struct usb_host_endpoint *endpoint);
extern void usb_enable_endpoint(struct usb_device *dev,
struct usb_host_endpoint *ep);
extern void usb_disable_endpoint (struct usb_device *dev, unsigned int epaddr);
extern void usb_disable_interface (struct usb_device *dev,
struct usb_interface *intf);

2
include/linux/usb.h
View File

@ -52,6 +52,7 @@ struct ep_device;
* @ep_dev: ep_device for sysfs info
* @extra: descriptors following this endpoint in the configuration
* @extralen: how many bytes of "extra" are valid
* @enabled: URBs may be submitted to this endpoint
*
* USB requests are always queued to a given endpoint, identified by a
* descriptor within an active interface in a given USB configuration.
@ -64,6 +65,7 @@ struct usb_host_endpoint {
unsigned char *extra; /* Extra descriptors */
int extralen;
int enabled;
};
/* host-side wrapper for one interface setting's parsed descriptors */