sound: Implement asynchronous device detach

Hot-unplugging a sound device, such as a USB sound card, whilst being
consumed by an application, results in an infinite loop until either the
application

sound: Implement asynchronous device detach

Hot-unplugging a sound device, such as a USB sound card, whilst being
consumed by an application, results in an infinite loop until either the
application closes the device's file descriptor, or the channel
automatically times out after hw.snd.timeout seconds. In the case of a
detach however, the timeout approach is still not ideal, since we want
all resources to be released immediatelly, without waiting for N seconds
until we can use the bus again.

The timeout mechanism works by calling chn_sleep() in chn_read() and
chn_write() (see pcm/channel.c) in order to send the thread to sleep,
using cv_timedwait_sig(). Since chn_sleep() sets the CHN_F_SLEEPING flag
while waiting for cv_timedwait_sig() to return, we can test this flag in
pcm_unregister() (called during detach) and wakeup the sleeping
thread(s) to immediately kill the channel(s) being consumed.

Sponsored by: The FreeBSD Foundation
MFC after: 2 months
PR: 194727
Reviewed by: dev_submerge.ch, bapt, markj
Differential Revision: https://reviews.freebsd.org/D43545

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Revert "sound: Implement asynchronous device detach"

This reverts commit 9eff58c6d52b66eb8abe7f724dabcd804a566df4.

We are reverting dc831e93bad6 ("sound: Get rid of snd_clone and use
DEVFS_CDEVPRIV

Revert "sound: Implement asynchronous device detach"

This reverts commit 9eff58c6d52b66eb8abe7f724dabcd804a566df4.

We are reverting dc831e93bad6 ("sound: Get rid of snd_clone and use
DEVFS_CDEVPRIV(9)"), so revert this commit as well since it depends
dc831e93bad6.

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sound: Implement asynchronous device detach

Hot-unplugging a sound device, such as a USB sound card, whilst being
consumed by an application, results in an infinite loop until either the
application

sound: Implement asynchronous device detach

Hot-unplugging a sound device, such as a USB sound card, whilst being
consumed by an application, results in an infinite loop until either the
application closes the device's file descriptor, or the channel
automatically times out after hw.snd.timeout seconds. In the case of a
detach however, the timeout approach is still not ideal, since we want
all resources to be released immediatelly, without waiting for N seconds
until we can use the bus again.

The timeout mechanism works by calling chn_sleep() in chn_read() and
chn_write() (see pcm/channel.c) in order to send the thread to sleep,
using cv_timedwait_sig(). Since chn_sleep() sets the CHN_F_SLEEPING flag
while waiting for cv_timedwait_sig() to return, we can test this flag in
pcm_unregister() (called during detach) and wakeup the sleeping
thread(s) to immediately kill the channel(s) being consumed.

Sponsored by: The FreeBSD Foundation
MFC after: 2 months
PR: 194727, 278055, 202275, 220949, 272286
Reviewed by: dev_submerge.ch, markj
Differential Revision: https://reviews.freebsd.org/D43545

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snd_uaudio.4: document sysctls

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: dev_submerge.ch
Differential Revision: https://reviews.freebsd.org/D43649

snd_uaudio.4: remove useless .Tn macro

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D43651

Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Merge ^/head r308491 through r308841.

Fix a broken link to the USB audio class specs.

PR: 214240
Submitted by: Tobias Kortkamp t@tobik.me
MFC after: 5 days

Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from HEAD

MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Fix some style issues.

MFC after: 1 week

Add more known bugs to the USB audio manual page.

MFC after: 1 week

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

use .Mt to mark up email addresses consistently (final part)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

- Add missing xhci(4) manual page.
- Minor update in some USB manual pages.

MFC after: 3 days
Approved by: thompsa (mentor)

Update to current version of head.

IFH@204581

The NetBSD Foundation has granted permission to remove clause 3 and 4 from
their software.

Obtained from: NetBSD

Use the newly brought %U macro.

Make the SYNOPSIS section a bit more informative.

Update sound-related manpages to account for the recent change in
device and module naming. The following files were repo-copied:

csa.4 -> snd_csa.4
gusc.4 -> snd_gusc.4
maestro3.4 -> snd_maestr

Update sound-related manpages to account for the recent change in
device and module naming. The following files were repo-copied:

csa.4 -> snd_csa.4
gusc.4 -> snd_gusc.4
maestro3.4 -> snd_maestro3.4
sbc.4 -> snd_sbc.4
uaudio.4 -> snd_uaudio.4

The pcm(4) manpage wasn't renamed to sound(4) as there are nearby
plans to rename "device sound" to "device snd", to address the
ambiguity in naming, so pcm.4 is linked to sound.4 for the moment.
(We also mumble something about the future plans in the manpage.)

Removed links from pcm.4 to als4000.4 and emu10k1.4 -- they now
have their own snd_*.4 manpages.

Fixes for recent snd_*.4 manpages: added missing "device sound"
to the SYNOPSIS, fixed hints (they are still "hint.pcm.<unit>"
in most cases).

MT5 after: 3 days

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