Man page 9 : usb_ep_alloc_request

usb_ep_alloc_request - allocate a request object to use with this endpoint

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

ep
    the endpoint to be used with with the request

gfp_flags
    GFP_* flags to use

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.

David Brownell <>
    Author.