CVS commit: src/sys/dev/usb

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Wed Feb 12 16:00:17 UTC 2020

Modified Files:
        src/sys/dev/usb: usbdi.c usbdivar.h

Log Message:
New xfer state variables ux_timeout_set and ux_timeout_reset.

These are needed because:

- The host controller interrupt cannot wait for the callout or task
  to finish running.

- Nothing in the USBD API as is waits for the callout or task to
  finish running.

- Callers expect to be able to resubmit USB xfers from xfer callbacks
  without waiting for anything to finish running.

The variable ux_timeout_set can be used by a host controller to
decide on submission whether to schedule the callout or to ask an
already-scheduled callout or already-queued task to reschedule the
callout, by setting the variable ux_timeout_reset to true.

When the callout or task runs and sees that ux_timeout_reset is true,
rather than queue the task or abort the xfer, it can instead just
schedule the callout anew.


To generate a diff of this commit:
cvs rdiff -u -r1.190 -r1.191 src/sys/dev/usb/usbdi.c
cvs rdiff -u -r1.120 -r1.121 src/sys/dev/usb/usbdivar.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.