@@ -1055,8 +1055,15 @@ 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);
}
@@ -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);
@@ -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)
@@ -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);
@@ -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);
@@ -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);
@@ -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;
@@ -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);
@@ -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)
@@ -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);
In the former commits, the callback of isochronous context runs on work process. In the case, ALSA PCM device has a flag, nonatomic, to acquire mutex lock instead of spin lock for PCM substream group. This commit uses the flag. It has an advantage in the case that ALSA PCM application uses the large size of intermediate buffer, since it takes too long time even in tasklet softIRQ to process many of isochronous packets. It could result in the delay of system event due to disabled IRQ so long. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- sound/firewire/amdtp-stream.c | 9 ++++++++- sound/firewire/bebob/bebob_pcm.c | 1 + sound/firewire/dice/dice-pcm.c | 1 + sound/firewire/digi00x/digi00x-pcm.c | 1 + sound/firewire/fireface/ff-pcm.c | 1 + sound/firewire/fireworks/fireworks_pcm.c | 1 + sound/firewire/isight.c | 1 + sound/firewire/motu/motu-pcm.c | 1 + sound/firewire/oxfw/oxfw-pcm.c | 1 + sound/firewire/tascam/tascam-pcm.c | 1 + 10 files changed, 17 insertions(+), 1 deletion(-)