|USBA_HCDI_DUP_INTER_REQ(9F)||Kernel Functions for Drivers||USBA_HCDI_DUP_INTER_REQ(9F)|
*dip, usb_intr_req_t *irqp,
size_t size, usb_flags_t
This is a private function that is not part of the stable DDI. It may be removed or changed at any time.
Note, the request may still fail even if USB_FLAGS_SLEEP is specified.
usba_hcdi_dup_intr_req() function is used to duplicate an existing interrupt request, irqp.
The USBA framework initiates interrupt operations through the usba_hcdi_pipe_intr_xfer(9E) entry point. It provides an initial USB interrupt request as an argument. When the HCD driver has interrupt data to return, it needs to duplicate that initial interrupt request each time that it submits data through the usba_hcdi_cb(9F) function. In addition to duplicating the request, callers may also need to increase the pipe handle's request count. For more information, see usba_hcdi_pipe_intr_xfer(9E).
The dip argument should correspond to the
HCD driver's dev_info_t structure. The
irqp pointer should correspond to the initial
interrupt request. The size argument should describe
the maximum amount of data needed for this request. The amount of data will
be dependent on the endpoint and device. The value of
flags should depend on the caller's context. If
USB_FLAGS_SLEEP is passed while in interrupt
context, then this function will fail.
usba_hcdi_dup_intr_req() function may be called from user, kernel, or interrupt context; however, when in interrupt context, the value of flags must be USB_FLAGS_NOSLEEP.
usba_hcdi_dup_intr_req() function returns a pointer to a duplicated interrupt request. Otherwise, NULL is returned to indicate that the request could not be duplicated.
|May 10, 2016||OmniOS|