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-rw-r--r--sound/firewire/amdtp-stream.c34
-rw-r--r--sound/firewire/bebob/bebob_pcm.c1
-rw-r--r--sound/firewire/dice/dice-pcm.c1
-rw-r--r--sound/firewire/digi00x/digi00x-pcm.c1
-rw-r--r--sound/firewire/fireface/ff-pcm.c1
-rw-r--r--sound/firewire/fireworks/fireworks_pcm.c1
-rw-r--r--sound/firewire/isight.c1
-rw-r--r--sound/firewire/motu/motu-pcm.c1
-rw-r--r--sound/firewire/oxfw/oxfw-pcm.c1
-rw-r--r--sound/firewire/tascam/tascam-pcm.c1
10 files changed, 36 insertions, 7 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index c827d7d8d800..c72b2a754775 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -615,6 +615,22 @@ static void update_pcm_pointers(struct amdtp_stream *s,
// The program in user process should periodically check the status of intermediate
// buffer associated to PCM substream to process PCM frames in the buffer, instead
// of receiving notification of period elapsed by poll wait.
+ //
+ // Use another work item for period elapsed event to prevent the following AB/BA
+ // deadlock:
+ //
+ // thread 1 thread 2
+ // ================================= =================================
+ // A.work item (process) pcm ioctl (process)
+ // v v
+ // process_rx_packets() B.PCM stream lock
+ // process_tx_packets() v
+ // v callbacks in snd_pcm_ops
+ // update_pcm_pointers() v
+ // snd_pcm_elapsed() fw_iso_context_flush_completions()
+ // snd_pcm_stream_lock_irqsave() disable_work_sync()
+ // v v
+ // wait until release of B wait until A exits
if (!pcm->runtime->no_period_wakeup)
queue_work(system_highpri_wq, &s->period_work);
}
@@ -1055,8 +1071,15 @@ static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *de
static inline void cancel_stream(struct amdtp_stream *s)
{
+ struct work_struct *work = current_work();
+
s->packet_index = -1;
- if (in_softirq())
+
+ // Detect work items for any isochronous context. The work item for pcm_period_work()
+ // should be avoided since the call of snd_pcm_period_elapsed() can reach via
+ // snd_pcm_ops.pointer() under acquiring PCM stream(group) lock and causes dead lock at
+ // snd_pcm_stop_xrun().
+ if (work && work != &s->period_work)
amdtp_stream_pcm_abort(s);
WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN);
}
@@ -1856,12 +1879,9 @@ unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d,
struct amdtp_stream *irq_target = d->irq_target;
if (irq_target && amdtp_stream_running(irq_target)) {
- // use wq to prevent AB/BA deadlock competition for
- // substream lock:
- // fw_iso_context_flush_completions() acquires
- // lock by ohci_flush_iso_completions(),
- // amdtp-stream process_rx_packets() attempts to
- // acquire same lock by snd_pcm_elapsed()
+ // The work item to call snd_pcm_period_elapsed() can reach here by the call of
+ // snd_pcm_ops.pointer(), however less packets would be available then. Therefore
+ // the following call is just for user process contexts.
if (current_work() != &s->period_work)
fw_iso_context_flush_completions(irq_target->context);
}
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index ce49eef0fcba..360ebf3c4ca2 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -367,6 +367,7 @@ int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
goto end;
pcm->private_data = bebob;
+ pcm->nonatomic = true;
snprintf(pcm->name, sizeof(pcm->name),
"%s PCM", bebob->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index d64366217d57..2cf2adb48f2a 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -441,6 +441,7 @@ int snd_dice_create_pcm(struct snd_dice *dice)
if (err < 0)
return err;
pcm->private_data = dice;
+ pcm->nonatomic = true;
strcpy(pcm->name, dice->card->shortname);
if (capture > 0)
diff --git a/sound/firewire/digi00x/digi00x-pcm.c b/sound/firewire/digi00x/digi00x-pcm.c
index 3bd1575c9d9c..85e65cbc00c4 100644
--- a/sound/firewire/digi00x/digi00x-pcm.c
+++ b/sound/firewire/digi00x/digi00x-pcm.c
@@ -350,6 +350,7 @@ int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
return err;
pcm->private_data = dg00x;
+ pcm->nonatomic = true;
snprintf(pcm->name, sizeof(pcm->name),
"%s PCM", dg00x->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c
index ec915671a79b..63457d24a288 100644
--- a/sound/firewire/fireface/ff-pcm.c
+++ b/sound/firewire/fireface/ff-pcm.c
@@ -390,6 +390,7 @@ int snd_ff_create_pcm_devices(struct snd_ff *ff)
return err;
pcm->private_data = ff;
+ pcm->nonatomic = true;
snprintf(pcm->name, sizeof(pcm->name),
"%s PCM", ff->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index c3c21860b245..eaf7778211de 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -397,6 +397,7 @@ int snd_efw_create_pcm_devices(struct snd_efw *efw)
goto end;
pcm->private_data = efw;
+ pcm->nonatomic = true;
snprintf(pcm->name, sizeof(pcm->name), "%s PCM", efw->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index 806f82c9ceee..b1e059f0d473 100644
--- a/sound/firewire/isight.c
+++ b/sound/firewire/isight.c
@@ -454,6 +454,7 @@ static int isight_create_pcm(struct isight *isight)
if (err < 0)
return err;
pcm->private_data = isight;
+ pcm->nonatomic = true;
strcpy(pcm->name, "iSight");
isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
isight->pcm->ops = &ops;
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index d410c2efbde5..f3b48495acae 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -360,6 +360,7 @@ int snd_motu_create_pcm_devices(struct snd_motu *motu)
if (err < 0)
return err;
pcm->private_data = motu;
+ pcm->nonatomic = true;
strcpy(pcm->name, motu->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
diff --git a/sound/firewire/oxfw/oxfw-pcm.c b/sound/firewire/oxfw/oxfw-pcm.c
index 5f43a0b826d2..8ca9dde54ec6 100644
--- a/sound/firewire/oxfw/oxfw-pcm.c
+++ b/sound/firewire/oxfw/oxfw-pcm.c
@@ -440,6 +440,7 @@ int snd_oxfw_create_pcm(struct snd_oxfw *oxfw)
return err;
pcm->private_data = oxfw;
+ pcm->nonatomic = true;
strcpy(pcm->name, oxfw->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
if (cap > 0)
diff --git a/sound/firewire/tascam/tascam-pcm.c b/sound/firewire/tascam/tascam-pcm.c
index f6da571707ac..a73003ac11e6 100644
--- a/sound/firewire/tascam/tascam-pcm.c
+++ b/sound/firewire/tascam/tascam-pcm.c
@@ -279,6 +279,7 @@ int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
return err;
pcm->private_data = tscm;
+ pcm->nonatomic = true;
snprintf(pcm->name, sizeof(pcm->name),
"%s PCM", tscm->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2025-01-14 16:10:32 +0000