CVS commit: src/sys/dev/usb

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

Module Name:    src
Committed By:   mrg
Date:           Sat Apr 20 05:53:18 UTC 2019

Modified Files:
        src/sys/dev/usb: ucom.c umodem_common.c umodemvar.h

Log Message:
fix umodem(4) detach:

- ucom(4) needs kpreempt disabled around softint_schedule()
- switch a copied printf() to aprint_error_dev()
- use static normally in umodem_common.c
- remove unused sc_openings in softc, convert sc_dying to real bool
- add sc_refcnt, sc_lock and sc_detach_cv to softc.  usage is:
  - sc_dying is protected by sc_lock
  - sc_detach_cv is matched with sc_lock for cv operations
  - sc_refcnt is increased in open and decreased in close, any time
    it is decreased, it is checked for less than zero, and a broadcast
    performed on sc_detach_cv.  detach waits for sc_refcnt.
- umodem_param() and umodem_set() check for sc_dying

this fixes pullout out an open ucom@umodem.

@skrll.

XXX: pullup


To generate a diff of this commit:
cvs rdiff -u -r1.121 -r1.122 src/sys/dev/usb/ucom.c
cvs rdiff -u -r1.26 -r1.27 src/sys/dev/usb/umodem_common.c
cvs rdiff -u -r1.9 -r1.10 src/sys/dev/usb/umodemvar.h

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