clean up ucom parents some more:
- it's always "bool sc_dying" now, with true/false
- heavy use of static functions
- remove all ucom parent ca_activate callbacks. they're never called.
- callbacks should generally do little to nothing if sc_dying is set
- open resources should be released in detach after setting sc_dying
- don't complain about usbd_abort_pipe() or usbd_close_pipe() failure
- when releasing resources, zero the softc member as well
- remove ucom_methods members no longer destined to be filled in
- generally, DPRINTF() before sc_dying short circuit
- use EIO when dying, not ENXIO or 0
- add some ucom_open() callbacks that simply return EIO if dying

revert most of:

>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

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.

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

branches: 1.9.10;
Merge nick-nhusb

- API / infrastructure changes to support memory management changes.
- Memory management improvements and bug fixes.
- HCDs should now be MP safe
- conversion to KERNHIST based debug
- FS/LS isoc support on ehci(4).
- conversion to kmem(9)
- Some USB 3 support - mostly from Takahiro HAYASHI (t-hash).
- interrupt transfers now get proper DMA operations
- general bug fixes
- kern/48308
- uhub status notification improvements
- umass(4) probe fix (applied to HEAD already)
- ohci(4) short transfer fix

branches: 1.8.20; 1.8.36; 1.8.38; 1.8.42;
Stop using the compatibility macros USB_ATTACH(), USB_DETACH(),
USB_MATCH(), et cetera. These files produce the same assembly
(according to objdump -d) before and after the change

branches: 1.7.20; 1.7.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.6.6; 1.6.8; 1.6.10;
Use device_t and its accessor functions.

Register _childdetached methods with drivers that attach children.
Wait to set child references to NULL there, instead of doing that
in the detach method.

Replace many uses of USB_DECLARE_DRIVER() with CFATTACH_DECL2().

branches: 1.5.12; 1.5.18;
Introduce different autoconf interface attributes for USB drivers
matching (and handling) a whole device and those which match an
interface only. This will allow to enforce some rules, eg that
the former don't use interface information for matching or that the
latter don't modify global device state.
The previous way left too much freedom do the drivers which led to
inconsistencies and abuse.
For now, I've not changed locators and submatch rules, this will
happen later.
There should not be any change in behaviour, except in the case of
some drivers which did behave inconsistently:
if_atu, if_axe, uep: matched the configured device in the interface
stage, but did configuration again. I've converted them to match
in the device stage.
ustir, utoppy: matched in the interface stage, but only against
vendor/device information, and used any configuration/interface
without checking. Changed to match in device stage, and added
some simple code to configure and use the first interface.
If you have one of those devices, please test!

branches: 1.4.2; 1.4.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.3.26; 1.3.32;
merge ktrace-lwp.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8; 1.2.14; 1.2.16;
If CM descriptor is found, use the data interface in it;
if CM descriptor is NOT found but UNION descriotor is found,
use the data interface in it.
Do not require CM or ACM descriptors as long as
the data interface is found.

Should fix NetBSD PR #29754 by rivo nurges.

Split common modem part of umodem.c to umodem_common.c and umodemvar.h,
to be shared with other umodem-like drivers.

revert most of:

>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

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.

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

branches: 1.9.10;
Merge nick-nhusb

- API / infrastructure changes to support memory management changes.
- Memory management improvements and bug fixes.
- HCDs should now be MP safe
- conversion to KERNHIST based debug
- FS/LS isoc support on ehci(4).
- conversion to kmem(9)
- Some USB 3 support - mostly from Takahiro HAYASHI (t-hash).
- interrupt transfers now get proper DMA operations
- general bug fixes
- kern/48308
- uhub status notification improvements
- umass(4) probe fix (applied to HEAD already)
- ohci(4) short transfer fix

branches: 1.8.20; 1.8.36; 1.8.38; 1.8.42;
Stop using the compatibility macros USB_ATTACH(), USB_DETACH(),
USB_MATCH(), et cetera. These files produce the same assembly
(according to objdump -d) before and after the change

branches: 1.7.20; 1.7.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.6.6; 1.6.8; 1.6.10;
Use device_t and its accessor functions.

Register _childdetached methods with drivers that attach children.
Wait to set child references to NULL there, instead of doing that
in the detach method.

Replace many uses of USB_DECLARE_DRIVER() with CFATTACH_DECL2().

branches: 1.5.12; 1.5.18;
Introduce different autoconf interface attributes for USB drivers
matching (and handling) a whole device and those which match an
interface only. This will allow to enforce some rules, eg that
the former don't use interface information for matching or that the
latter don't modify global device state.
The previous way left too much freedom do the drivers which led to
inconsistencies and abuse.
For now, I've not changed locators and submatch rules, this will
happen later.
There should not be any change in behaviour, except in the case of
some drivers which did behave inconsistently:
if_atu, if_axe, uep: matched the configured device in the interface
stage, but did configuration again. I've converted them to match
in the device stage.
ustir, utoppy: matched in the interface stage, but only against
vendor/device information, and used any configuration/interface
without checking. Changed to match in device stage, and added
some simple code to configure and use the first interface.
If you have one of those devices, please test!

branches: 1.4.2; 1.4.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.3.26; 1.3.32;
merge ktrace-lwp.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8; 1.2.14; 1.2.16;
If CM descriptor is found, use the data interface in it;
if CM descriptor is NOT found but UNION descriotor is found,
use the data interface in it.
Do not require CM or ACM descriptors as long as
the data interface is found.

Should fix NetBSD PR #29754 by rivo nurges.

Split common modem part of umodem.c to umodem_common.c and umodemvar.h,
to be shared with other umodem-like drivers.

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

branches: 1.9.10;
Merge nick-nhusb

- API / infrastructure changes to support memory management changes.
- Memory management improvements and bug fixes.
- HCDs should now be MP safe
- conversion to KERNHIST based debug
- FS/LS isoc support on ehci(4).
- conversion to kmem(9)
- Some USB 3 support - mostly from Takahiro HAYASHI (t-hash).
- interrupt transfers now get proper DMA operations
- general bug fixes
- kern/48308
- uhub status notification improvements
- umass(4) probe fix (applied to HEAD already)
- ohci(4) short transfer fix

branches: 1.8.20; 1.8.36; 1.8.38; 1.8.42;
Stop using the compatibility macros USB_ATTACH(), USB_DETACH(),
USB_MATCH(), et cetera. These files produce the same assembly
(according to objdump -d) before and after the change

branches: 1.7.20; 1.7.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.6.6; 1.6.8; 1.6.10;
Use device_t and its accessor functions.

Register _childdetached methods with drivers that attach children.
Wait to set child references to NULL there, instead of doing that
in the detach method.

Replace many uses of USB_DECLARE_DRIVER() with CFATTACH_DECL2().

branches: 1.5.12; 1.5.18;
Introduce different autoconf interface attributes for USB drivers
matching (and handling) a whole device and those which match an
interface only. This will allow to enforce some rules, eg that
the former don't use interface information for matching or that the
latter don't modify global device state.
The previous way left too much freedom do the drivers which led to
inconsistencies and abuse.
For now, I've not changed locators and submatch rules, this will
happen later.
There should not be any change in behaviour, except in the case of
some drivers which did behave inconsistently:
if_atu, if_axe, uep: matched the configured device in the interface
stage, but did configuration again. I've converted them to match
in the device stage.
ustir, utoppy: matched in the interface stage, but only against
vendor/device information, and used any configuration/interface
without checking. Changed to match in device stage, and added
some simple code to configure and use the first interface.
If you have one of those devices, please test!

branches: 1.4.2; 1.4.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.3.26; 1.3.32;
merge ktrace-lwp.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8; 1.2.14; 1.2.16;
If CM descriptor is found, use the data interface in it;
if CM descriptor is NOT found but UNION descriotor is found,
use the data interface in it.
Do not require CM or ACM descriptors as long as
the data interface is found.

Should fix NetBSD PR #29754 by rivo nurges.

Split common modem part of umodem.c to umodem_common.c and umodemvar.h,
to be shared with other umodem-like drivers.

Merge nick-nhusb

- API / infrastructure changes to support memory management changes.
- Memory management improvements and bug fixes.
- HCDs should now be MP safe
- conversion to KERNHIST based debug
- FS/LS isoc support on ehci(4).
- conversion to kmem(9)
- Some USB 3 support - mostly from Takahiro HAYASHI (t-hash).
- interrupt transfers now get proper DMA operations
- general bug fixes
- kern/48308
- uhub status notification improvements
- umass(4) probe fix (applied to HEAD already)
- ohci(4) short transfer fix

branches: 1.8.38; 1.8.42;
Stop using the compatibility macros USB_ATTACH(), USB_DETACH(),
USB_MATCH(), et cetera. These files produce the same assembly
(according to objdump -d) before and after the change

branches: 1.7.20; 1.7.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.6.6; 1.6.8; 1.6.10;
Use device_t and its accessor functions.

Register _childdetached methods with drivers that attach children.
Wait to set child references to NULL there, instead of doing that
in the detach method.

Replace many uses of USB_DECLARE_DRIVER() with CFATTACH_DECL2().

branches: 1.5.12; 1.5.18;
Introduce different autoconf interface attributes for USB drivers
matching (and handling) a whole device and those which match an
interface only. This will allow to enforce some rules, eg that
the former don't use interface information for matching or that the
latter don't modify global device state.
The previous way left too much freedom do the drivers which led to
inconsistencies and abuse.
For now, I've not changed locators and submatch rules, this will
happen later.
There should not be any change in behaviour, except in the case of
some drivers which did behave inconsistently:
if_atu, if_axe, uep: matched the configured device in the interface
stage, but did configuration again. I've converted them to match
in the device stage.
ustir, utoppy: matched in the interface stage, but only against
vendor/device information, and used any configuration/interface
without checking. Changed to match in device stage, and added
some simple code to configure and use the first interface.
If you have one of those devices, please test!

branches: 1.4.2; 1.4.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.3.26; 1.3.32;
merge ktrace-lwp.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8; 1.2.14; 1.2.16;
If CM descriptor is found, use the data interface in it;
if CM descriptor is NOT found but UNION descriotor is found,
use the data interface in it.
Do not require CM or ACM descriptors as long as
the data interface is found.

Should fix NetBSD PR #29754 by rivo nurges.

Split common modem part of umodem.c to umodem_common.c and umodemvar.h,
to be shared with other umodem-like drivers.