table of contents
| USB_HCD_LINK_URB_TO_(9) | Host Controller APIs | USB_HCD_LINK_URB_TO_(9) |
NAME¶
usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
SYNOPSIS¶
int usb_hcd_link_urb_to_ep(struct usb_hcd * hcd, struct urb * urb);
ARGUMENTS¶
hcd
host controller to which urb was submitted
urb
URB being submitted
DESCRIPTION¶
Host controller drivers should call this routine in their enqueue method. The HCD´s private spinlock must be held and interrupts must be disabled. The actions carried out here are required for URB submission, as well as for endpoint shutdown and for usb_kill_urb.
Returns 0 for no error, otherwise a negative error code (in which case the enqueue method must fail). If no error occurs but enqueue fails anyway, it must call usb_hcd_unlink_urb_from_ep before releasing the private spinlock and returning.
COPYRIGHT¶
| April 2023 | Kernel Hackers Manual 2.6. |