usb_ep_alloc_request

Langue: en

Autres versions - même langue

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

Sommaire

NAME

usb_ep_alloc_request - allocate a request object to use with this endpoint

SYNOPSIS

struct usb_request * usb_ep_alloc_request(struct usb_ep * ep, gfp_t gfp_flags);

ARGUMENTS

ep

the endpoint to be used with with the request

gfp_flags

GFP_* flags to use

DESCRIPTION

Request objects must be allocated with this call, since they normally need controller-specific setup and may even need endpoint-specific resources such as allocation of DMA descriptors. Requests may be submitted with usb_ep_queue, and receive a single completion callback. Free requests with usb_ep_free_request, when they are no longer needed.

Returns the request, or null if one could not be allocated.

AUTHOR

David Brownell <dbrownell@users.sourceforge.net>

Author.