USB Gadget API for Linux
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usb_ep_alloc_request

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, int 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.

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