usb_alloc_urb (9) - Linux Man Pages

usb_alloc_urb: creates a new urb for a USB driver to use

NAME

usb_alloc_urb - creates a new urb for a USB driver to use

SYNOPSIS

struct urb * usb_alloc_urb(int iso_packets, gfp_t mem_flags);

ARGUMENTS

iso_packets

number of iso packets for this urb

mem_flags

the type of memory to allocate, see kmalloc for a list of valid options for this.

DESCRIPTION

Creates an urb for the USB driver to use, initializes a few internal structures, increments the usage counter, and returns a pointer to it.

If the driver want to use this urb for interrupt, control, or bulk endpoints, pass '0' as the number of iso packets.

The driver must call usb_free_urb when it is finished with the urb.

RETURN

A pointer to the new urb, or NULL if no memory is available.

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