table of contents
| USB_ALLOC_URB(9) | USB Core APIs | USB_ALLOC_URB(9) |
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, incrementes the usage counter, and returns a pointer to it.
If no memory is available, NULL is returned.
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.
COPYRIGHT¶
| May 2024 | Kernel Hackers Manual 2.6. |