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Revert "sound: Implement asynchronous device detach"
This reverts commit9eff58c6d5
. We are revertingdc831e93ba
("sound: Get rid of snd_clone and use DEVFS_CDEVPRIV(9)"), so revert this commit as well since it dependsdc831e93ba
.
This commit is contained in:
parent
5ffb19ac36
commit
365067e98e
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@ -27,7 +27,7 @@
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 26, 2024
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.Dd January 29, 2024
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.Dt SND_UAUDIO 4
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.Os
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.Sh NAME
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@ -156,6 +156,15 @@ and modified for
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by
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.An Hiten Pandya Aq Mt hmp@FreeBSD.org .
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.Sh BUGS
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The PCM framework in
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.Fx
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only supports synchronous device detach.
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That means all mixer and DSP character devices belonging to a given
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USB audio device must be closed when receiving an error on a DSP read,
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a DSP write or a DSP IOCTL request.
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Else the USB audio driver will wait for this to happen, preventing
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enumeration of new devices on the parenting USB controller.
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.Pp
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Some USB audio devices might refuse to work properly unless the sample
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rate is configured the same for both recording and playback, even if
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only simplex is used.
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@ -295,7 +295,7 @@ dsp_close(void *data)
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d = priv->sc;
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/* At this point pcm_unregister() will destroy all channels anyway. */
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if (PCM_DETACHING(d))
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if (!PCM_REGISTERED(d))
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goto skip;
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PCM_GIANT_ENTER(d);
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@ -817,6 +817,17 @@ mixer_uninit(device_t dev)
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KASSERT(m->type == MIXER_TYPE_PRIMARY,
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("%s(): illegal mixer type=%d", __func__, m->type));
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snd_mtxlock(m->lock);
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if (m->busy) {
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snd_mtxunlock(m->lock);
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return EBUSY;
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}
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/* destroy dev can sleep --hps */
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snd_mtxunlock(m->lock);
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pdev->si_drv1 = NULL;
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destroy_dev(pdev);
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@ -1001,22 +1001,26 @@ pcm_unregister(device_t dev)
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CHN_FOREACH(ch, d, channels.pcm) {
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CHN_LOCK(ch);
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if (ch->flags & CHN_F_SLEEPING) {
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/*
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* We are detaching, so do not wait for the timeout in
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* chn_read()/chn_write(). Wake up the thread and kill
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* the channel immediately.
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*/
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CHN_BROADCAST(&ch->intr_cv);
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ch->flags |= CHN_F_DEAD;
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if (ch->refcount > 0) {
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device_printf(dev,
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"unregister: channel %s busy (pid %d)\n",
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ch->name, ch->pid);
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CHN_UNLOCK(ch);
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PCM_RELEASE_QUICK(d);
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return (EBUSY);
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}
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chn_abort(ch);
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CHN_UNLOCK(ch);
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}
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dsp_destroy_dev(dev);
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(void)mixer_uninit(dev);
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if (mixer_uninit(dev) == EBUSY) {
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device_printf(dev, "unregister: mixer busy\n");
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PCM_LOCK(d);
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PCM_RELEASE(d);
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PCM_UNLOCK(d);
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return (EBUSY);
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}
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/* remove /dev/sndstat entry first */
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sndstat_unregister(dev);
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@ -1255,13 +1255,20 @@ uaudio_detach_sub(device_t dev)
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unsigned i = uaudio_get_child_index_by_dev(sc, dev);
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int error = 0;
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repeat:
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if (sc->sc_child[i].pcm_registered) {
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error = pcm_unregister(dev);
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} else if (sc->sc_child[i].mixer_init) {
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} else {
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if (sc->sc_child[i].mixer_init)
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error = mixer_uninit(dev);
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}
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return (error);
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if (error) {
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device_printf(dev, "Waiting for sound application to exit!\n");
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usb_pause_mtx(NULL, 2 * hz);
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goto repeat; /* try again */
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}
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return (0); /* success */
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}
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static int
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