Module Name: src
Committed By: mrg
Date: Mon May 6 23:46:25 UTC 2019
Modified Files:
src/sys/dev/usb: uchcom.c
Log Message:
revert most of:
>fix uchcom(4) detach, like umodem(4) recently:
>
>- use static normally in umodem_common.c
>- 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
> - uchcom_param() and uchcom_set() check for sc_dying
>
>this fixes pullout out an open ucom@uchcom.
it only fixes the issue by chance (slightly delays, which
allows task to run, but there is no guarantee. real fix
is incoming for all ucom parents.
To generate a diff of this commit:
cvs rdiff -u -r1.31 -r1.32 src/sys/dev/usb/uchcom.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
