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Revert "ALSA: firewire-lib: obsolete workqueue for period update"

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prepare resolution of AB/BA deadlock competition for substream lock:
restore workqueue previously used for process context:

revert commit b5b519965c ("ALSA: firewire-lib: obsolete workqueue
for period update")

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/kwryofzdmjvzkuw6j3clftsxmoolynljztxqwg76hzeo4simnl@jn3eo7pe642q/
Signed-off-by: Edmund Raile <edmund.raile@protonmail.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20240730195318.869840-2-edmund.raile@protonmail.com
This commit is contained in:
Edmund Raile 2024-07-30 19:53:26 +00:00 committed by Takashi Iwai
parent 3c0b6f924e
commit 6ccf9984d6
2 changed files with 16 additions and 0 deletions
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15
sound/firewire/amdtp-stream.c
View File

@ -77,6 +77,8 @@
// overrun. Actual device can skip more, then this module stops the packet streaming.
#define IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES 5
static void pcm_period_work(struct work_struct *work);
/**
* amdtp_stream_init - initialize an AMDTP stream structure
* @s: the AMDTP stream to initialize
@ -105,6 +107,7 @@ int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
s->flags = flags;
s->context = ERR_PTR(-1);
mutex_init(&s->mutex);
INIT_WORK(&s->period_work, pcm_period_work);
s->packet_index = 0;
init_waitqueue_head(&s->ready_wait);
@ -347,6 +350,7 @@ EXPORT_SYMBOL(amdtp_stream_get_max_payload);
*/
void amdtp_stream_pcm_prepare(struct amdtp_stream *s)
{
cancel_work_sync(&s->period_work);
s->pcm_buffer_pointer = 0;
s->pcm_period_pointer = 0;
}
@ -624,6 +628,16 @@ static void update_pcm_pointers(struct amdtp_stream *s,
}
}
static void pcm_period_work(struct work_struct *work)
{
struct amdtp_stream *s = container_of(work, struct amdtp_stream,
period_work);
struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
if (pcm)
snd_pcm_period_elapsed(pcm);
}
static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params,
bool sched_irq)
{
@ -1910,6 +1924,7 @@ static void amdtp_stream_stop(struct amdtp_stream *s)
return;
}
cancel_work_sync(&s->period_work);
fw_iso_context_stop(s->context);
fw_iso_context_destroy(s->context);
s->context = ERR_PTR(-1);

1
sound/firewire/amdtp-stream.h
View File

@ -191,6 +191,7 @@ struct amdtp_stream {
/* For a PCM substream processing. */
struct snd_pcm_substream *pcm;
struct work_struct period_work;
snd_pcm_uframes_t pcm_buffer_pointer;
unsigned int pcm_period_pointer;
unsigned int pcm_frame_multiplier;