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ALSA: firewire-lib: add a kernel API to stop a couple of AMDTP streams in AMDTP domain

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This commit adds a kernel API to stop a couple of isochronous contexts
for AMDTP streams. The API is not protected with any lock primitive.
Callers should use this with enough lock against concurrent access.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-08-04 15:21:21 +09:00 committed by Takashi Iwai
parent 3ec3d7a3ff
commit 6261f90bdb
2 changed files with 21 additions and 0 deletions
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16
sound/firewire/amdtp-stream.c
View File

@ -1158,3 +1158,19 @@ void amdtp_domain_destroy(struct amdtp_domain *d)
WARN_ON(!list_empty(&d->streams));
}
EXPORT_SYMBOL_GPL(amdtp_domain_destroy);
/**
* amdtp_domain_stop - stop sending packets for isoc context in the same domain.
* @d: the AMDTP domain to which the isoc contexts belong.
*/
void amdtp_domain_stop(struct amdtp_domain *d)
{
struct amdtp_stream *s, *next;
list_for_each_entry_safe(s, next, &d->streams, list) {
list_del(&s->list);
amdtp_stream_stop(s);
}
}
EXPORT_SYMBOL_GPL(amdtp_domain_stop);

5
sound/firewire/amdtp-stream.h
View File

@ -170,6 +170,9 @@ struct amdtp_stream {
/* For backends to process data blocks. */
void *protocol;
amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
// For domain.
struct list_head list;
};
int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
@ -274,4 +277,6 @@ struct amdtp_domain {
int amdtp_domain_init(struct amdtp_domain *d);
void amdtp_domain_destroy(struct amdtp_domain *d);
void amdtp_domain_stop(struct amdtp_domain *d);
#endif