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USB: add ep->enable

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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
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2
include/linux/usb.h
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@ -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 */