The branch main has been updated by christos: URL: https://cgit.FreeBSD.org/src/commit/?id=9a00e0b8ca566b6942874eb08c03baf035a17702
commit 9a00e0b8ca566b6942874eb08c03baf035a17702 Author: Christos Margiolis <[email protected]> AuthorDate: 2026-04-16 12:15:21 +0000 Commit: Christos Margiolis <[email protected]> CommitDate: 2026-05-27 15:32:11 +0000 snd_uaudio: Do not use snd_mixer->lock as mixer_lock In similar fashion to c234740c9d34 ("snd_uaudio: Do not use pcm_channel->lock to protect uaudio_chan"), stop this layering violation, and introduce a snd_uaudio(4)-internal mixer_lock. Sponsored by: The FreeBSD Foundation MFC after: 1 week Pull Request: https://ron-dev.freebsd.org/FreeBSD/src/pulls/18 --- sys/dev/sound/usb/uaudio.c | 31 +++++++++++-------------------- 1 file changed, 11 insertions(+), 20 deletions(-) diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c index f477eb768fde..27d5009da4fa 100644 --- a/sys/dev/sound/usb/uaudio.c +++ b/sys/dev/sound/usb/uaudio.c @@ -356,7 +356,7 @@ struct uaudio_hid { struct uaudio_softc_child { device_t pcm_device; - struct mtx *mixer_lock; + struct mtx mixer_lock; struct snd_mixer *mixer_dev; uint32_t mix_info; @@ -2955,12 +2955,9 @@ uaudio_mixer_sysctl_handler(SYSCTL_HANDLER_ARGS) sc = (struct uaudio_softc *)oidp->oid_arg1; hint = oidp->oid_arg2; - if (sc->sc_child[0].mixer_lock == NULL) - return (ENXIO); - /* lookup mixer node */ - mtx_lock(sc->sc_child[0].mixer_lock); + mtx_lock(&sc->sc_child[0].mixer_lock); for (pmc = sc->sc_mixer_root; pmc != NULL; pmc = pmc->next) { for (chan = 0; chan != (int)pmc->nchan; chan++) { if (pmc->wValue[chan] != -1 && @@ -2971,7 +2968,7 @@ uaudio_mixer_sysctl_handler(SYSCTL_HANDLER_ARGS) } } found: - mtx_unlock(sc->sc_child[0].mixer_lock); + mtx_unlock(&sc->sc_child[0].mixer_lock); error = sysctl_handle_int(oidp, &temp, 0, req); if (error != 0 || req->newptr == NULL) @@ -2979,7 +2976,7 @@ found: /* update mixer value */ - mtx_lock(sc->sc_child[0].mixer_lock); + mtx_lock(&sc->sc_child[0].mixer_lock); if (pmc != NULL && temp >= pmc->minval && temp <= pmc->maxval) { @@ -2989,7 +2986,7 @@ found: /* start the transfer, if not already started */ usbd_transfer_start(sc->sc_mixer_xfer[0]); } - mtx_unlock(sc->sc_child[0].mixer_lock); + mtx_unlock(&sc->sc_child[0].mixer_lock); return (0); } @@ -3220,10 +3217,7 @@ uaudio_mixer_reload_all(struct uaudio_softc *sc) struct uaudio_mixer_node *pmc; int chan; - if (sc->sc_child[0].mixer_lock == NULL) - return; - - mtx_lock(sc->sc_child[0].mixer_lock); + mtx_lock(&sc->sc_child[0].mixer_lock); for (pmc = sc->sc_mixer_root; pmc != NULL; pmc = pmc->next) { /* use reset defaults for non-oss controlled settings */ if (pmc->ctl == SOUND_MIXER_NRDEVICES) @@ -3235,7 +3229,7 @@ uaudio_mixer_reload_all(struct uaudio_softc *sc) /* start HID volume keys, if any */ usbd_transfer_start(sc->sc_hid.xfer[0]); - mtx_unlock(sc->sc_child[0].mixer_lock); + mtx_unlock(&sc->sc_child[0].mixer_lock); } static void @@ -5439,13 +5433,13 @@ uaudio_mixer_init_sub(struct uaudio_softc *sc, struct snd_mixer *m) DPRINTF("child=%u\n", i); - sc->sc_child[i].mixer_lock = mixer_get_lock(m); + mtx_init(&sc->sc_child[i].mixer_lock, "uaudio mixer lock", NULL, MTX_DEF); sc->sc_child[i].mixer_dev = m; if (i == 0 && usbd_transfer_setup(sc->sc_udev, &sc->sc_mixer_iface_index, sc->sc_mixer_xfer, uaudio_mixer_config, 1, sc, - sc->sc_child[i].mixer_lock)) { + &sc->sc_child[i].mixer_lock)) { DPRINTFN(0, "could not allocate USB transfer for mixer!\n"); return (ENOMEM); } @@ -5470,7 +5464,7 @@ uaudio_mixer_uninit_sub(struct uaudio_softc *sc, struct snd_mixer *m) if (index == 0) usbd_transfer_unsetup(sc->sc_mixer_xfer, 1); - sc->sc_child[index].mixer_lock = NULL; + mtx_destroy(&sc->sc_child[index].mixer_lock); return (0); } @@ -6186,9 +6180,6 @@ uaudio_hid_attach(struct uaudio_softc *sc, if (!(sc->sc_hid.flags & UAUDIO_HID_VALID)) return (-1); - if (sc->sc_child[0].mixer_lock == NULL) - return (-1); - /* Get HID descriptor */ error = usbd_req_get_hid_desc(uaa->device, NULL, &d_ptr, &d_len, M_TEMP, sc->sc_hid.iface_index); @@ -6247,7 +6238,7 @@ uaudio_hid_attach(struct uaudio_softc *sc, /* allocate USB transfers */ error = usbd_transfer_setup(uaa->device, &sc->sc_hid.iface_index, sc->sc_hid.xfer, uaudio_hid_config, UAUDIO_HID_N_TRANSFER, - sc, sc->sc_child[0].mixer_lock); + sc, &sc->sc_child[0].mixer_lock); if (error) { DPRINTF("error=%s\n", usbd_errstr(error)); return (-1);
