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diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -740,7 +740,6 @@
* and MIDI). Handle those special cases here.
*/
if (IOCGROUP(cmd) == 'X') {
- PCM_ACQUIRE(d);
switch(cmd) {
case SNDCTL_SYSINFO:
sound_oss_sysinfo((oss_sysinfo *)arg);
@@ -765,7 +764,6 @@
default:
ret = EINVAL;
}
- PCM_RELEASE(d);
PCM_GIANT_EXIT(d);
return (ret);
}
@@ -2164,27 +2162,24 @@
}
}
- PCM_UNLOCKASSERT(d);
- PCM_LOCK(d);
if ((ai->dev == -1 && d->dsp_dev == i_dev) ||
- (ai->dev == unit)) {
- PCM_UNLOCK(d);
+ (ai->dev == unit))
break;
- } else {
- PCM_UNLOCK(d);
- d = NULL;
- }
+ d = NULL;
}
- bus_topo_unlock();
- /* Exhausted the search -- nothing is locked, so return. */
- if (d == NULL)
+ /* Exhausted the search. */
+ if (d == NULL) {
+ bus_topo_unlock();
return (EINVAL);
+ }
- /* XXX Need Giant magic entry ??? */
-
- PCM_UNLOCKASSERT(d);
- PCM_LOCK(d);
+ /*
+ * Do not give up the topology lock until the device is busied, or it
+ * might detach between unlocking and busying.
+ */
+ PCM_ACQUIRE(d);
+ bus_topo_unlock();
bzero((void *)ai, sizeof(oss_audioinfo));
ai->dev = unit;
@@ -2270,7 +2265,7 @@
if (ai->min_channels == INT_MAX)
ai->min_channels = 0;
- PCM_UNLOCK(d);
+ PCM_RELEASE(d);
return (0);
}
@@ -2332,18 +2327,24 @@
* Search for the requested audio device (channel). Start by
* iterating over pcm devices.
*/
- bus_topo_lock();
- for (unit = 0; pcm_devclass != NULL &&
- unit < devclass_get_maxunit(pcm_devclass); unit++) {
+ for (unit = 0; ; unit++) {
+ bus_topo_lock();
+ if (pcm_devclass == NULL ||
+ unit >= devclass_get_maxunit(pcm_devclass)) {
+ bus_topo_unlock();
+ break;
+ }
d = devclass_get_softc(pcm_devclass, unit);
- if (!PCM_REGISTERED(d))
+ if (!PCM_REGISTERED(d)) {
+ bus_topo_unlock();
continue;
-
- /* XXX Need Giant magic entry ??? */
-
- /* See the note in function docblock */
- PCM_UNLOCKASSERT(d);
- PCM_LOCK(d);
+ }
+ /*
+ * Do not give up the topology lock until the device is busied,
+ * or it might detach between unlocking and busying.
+ */
+ PCM_ACQUIRE(d);
+ bus_topo_unlock();
CHN_FOREACH(ch, d, channels.pcm) {
CHN_UNLOCKASSERT(ch);
@@ -2357,7 +2358,7 @@
}
if (ch == NULL) {
- PCM_UNLOCK(d);
+ PCM_RELEASE(d);
continue;
}
@@ -2481,14 +2482,12 @@
ai->next_rec_engine = 0;
CHN_UNLOCK(ch);
- PCM_UNLOCK(d);
- bus_topo_unlock();
+ PCM_RELEASE(d);
return (0);
}
- bus_topo_unlock();
- /* Exhausted the search -- nothing is locked, so return. */
+ /* Exhausted the search. */
return (EINVAL);
}
diff --git a/sys/dev/sound/pcm/mixer.c b/sys/dev/sound/pcm/mixer.c
--- a/sys/dev/sound/pcm/mixer.c
+++ b/sys/dev/sound/pcm/mixer.c
@@ -887,6 +887,18 @@
return (EBADF);
PCM_GIANT_ENTER(d);
+
+ /*
+ * This group of ioctls can report info about any device in the system,
+ * and they busy each one as they inspect it, so they must not run with
+ * this device already busied, otherwise we will recurse on the sx.
+ */
+ if (IOCGROUP(cmd) == 'X') {
+ ret = mixer_ioctl_cmd(i_dev, cmd, arg, mode, td);
+ PCM_GIANT_EXIT(d);
+ return (ret);
+ }
+
PCM_ACQUIRE(d);
ret = mixer_ioctl_cmd(i_dev, cmd, arg, mode, td);
diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -509,18 +509,24 @@
j = 0;
- bus_topo_lock();
- for (i = 0; pcm_devclass != NULL &&
- i < devclass_get_maxunit(pcm_devclass); i++) {
+ for (i = 0; ; i++) {
+ bus_topo_lock();
+ if (pcm_devclass == NULL ||
+ i >= devclass_get_maxunit(pcm_devclass)) {
+ bus_topo_unlock();
+ break;
+ }
d = devclass_get_softc(pcm_devclass, i);
- if (!PCM_REGISTERED(d))
+ if (!PCM_REGISTERED(d)) {
+ bus_topo_unlock();
continue;
-
- /* XXX Need Giant magic entry ??? */
-
- /* See note in function's docblock */
- PCM_UNLOCKASSERT(d);
- PCM_LOCK(d);
+ }
+ /*
+ * Do not give up the topology lock until the device is busied,
+ * or it might detach between unlocking and busying.
+ */
+ PCM_ACQUIRE(d);
+ bus_topo_unlock();
si->numaudioengines += PCM_CHANCOUNT(d);
@@ -534,9 +540,8 @@
j++;
}
- PCM_UNLOCK(d);
+ PCM_RELEASE(d);
}
- bus_topo_unlock();
si->numsynths = 0; /* OSSv4 docs: this field is obsolete */
/**

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