ath(4): Stop checking for failures from malloc(M_WAITOK)

MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D45852

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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ath: clean up empty lines in .c and .h files

Merge ^/head r327341 through r327623.

ath: fix possible memory disclosures in ioctl handlers

Apply the fix from r327499 to additional ioctl handlers.

Reported by: Ilja van Sprundel <ivansprundel@ioactive.com>
MFC after: 1 week
MFC with

ath: fix possible memory disclosures in ioctl handlers

Apply the fix from r327499 to additional ioctl handlers.

Reported by: Ilja van Sprundel <ivansprundel@ioactive.com>
MFC after: 1 week
MFC with: r327499
Sponsored by: The FreeBSD Foundation

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sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error

sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Merge ^/head r313055 through r313300.

MFhead@r313243

[ath] ensure the NIC is woken up before changing the spectral scan parameters.

Merge head

IFC @264767

MFC @ r259205 in preparation for some SVM updates. (for real this time)

Merge head r232040 through r257457.
M usr.sbin/portsnap/portsnap/portsnap.8
M usr.sbin/portsnap/portsnap/portsnap.sh
M usr.sbin/tcpdump/tcpdump/Makefile

The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare
to this event, adding if_var.h to files that do need it. Also, include
all includes that now are included due to implicit po

The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare
to this event, adding if_var.h to files that do need it. Also, include
all includes that now are included due to implicit pollution via if_var.h

Sponsored by: Netflix
Sponsored by: Nginx, Inc.

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Merge fresh head.

IFC @247348.

Sync with HEAD.

IFC @ r245205

IFC @ r245178

Fix format size.

Add support for triggering spectral scan upon a channel reset/change.

This is intended to support reporting FFT results during active channel
scans, for users who would like to fiddle around with wr

Add support for triggering spectral scan upon a channel reset/change.

This is intended to support reporting FFT results during active channel
scans, for users who would like to fiddle around with writing applications
that do both FFT visualisation _and_ AP scanning.

* add a new ioctl to enable/trigger spectral scan at channel change/reset;
* set do_spectral consistently if it's enabled, so a channel set/reset
will carry forth the correct PHY error configuration so frames
are actually received;
* for NICs that don't do spectral scan, don't bother checking the
spectral scan state on channel change/reset.

Tested:

* AR9280 - STA and scanning;
* AR5416 - STA, ensured that the SS code doesn't panic

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IFC @ r244983.

Don't call the spectral methods for NICS that don't implement them.