CVS commit: src/sys/dev/usb

["matthew green" <mrg%netbsd.org@localhost>]

Module Name:    src
Committed By:   mrg
Date:           Fri Jun 21 14:19:46 UTC 2019

Modified Files:
        src/sys/dev/usb: if_axen.c

Log Message:
fix issues seen with transfers being reused before they are finished
being used.

adapt locking to the modern world.  some what inspired by if_smsc.c:
- add locks for softc, rx and tx
- add safe detach support
- safe detach vs mii lock requires 2 methods to lock the MII lock,
- check axen_dying and new axen_stopping more often
- consolidate checks to reduce the number of error paths that need
  to release a resource
- move axen_watchdog() out of if_timer into the tick task to
  prepare for MPSAFEification

TODO:
- remove spl usage
- enable mpsafe

special thanks to skrll and mlelstv for clearing up various
confusion and providing examples.


To generate a diff of this commit:
cvs rdiff -u -r1.43 -r1.44 src/sys/dev/usb/if_axen.c

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