diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2023-01-09 11:17:36 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-01-09 17:04:43 +0100 |
| commit | cec371ff1ab18ddd23ac483e7689d0819c09bf7b (patch) | |
| tree | fbded6370be2c2b8963f62aef3c095e9aa027c9b /sound/firewire/amdtp-stream.h | |
| parent | c38d8cff9cdc8101a2df7a55a86d45f279728873 (diff) | |
ALSA: firewire-lib: use circular linked list to enumerate packet descriptors
Current implementation uses list of packet descriptor as template to
schedule isochronous packet. The packet descriptors are operated by
position and size, while circular linked list is convenient to enumerate
the packet descriptors.
This commit utilizes circular linked list for the purpose.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230109021738.75543-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp-stream.h')
| -rw-r--r-- | sound/firewire/amdtp-stream.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h index f021c1f49137..4bf701796166 100644 --- a/sound/firewire/amdtp-stream.h +++ b/sound/firewire/amdtp-stream.h @@ -103,6 +103,7 @@ struct pkt_desc { unsigned int data_blocks; unsigned int data_block_counter; __be32 *ctx_payload; + struct list_head link; }; struct amdtp_stream; @@ -126,6 +127,7 @@ struct amdtp_stream { unsigned int queue_size; int packet_index; struct pkt_desc *pkt_descs; + struct list_head packet_descs_list; int tag; union { struct { @@ -276,6 +278,16 @@ static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, WRITE_ONCE(s->pcm, pcm); } +/** + * amdtp_stream_next_packet_desc - retrieve next descriptor for amdtp packet. + * @s: the AMDTP stream + * @desc: the descriptor of packet + * + * This macro computes next descriptor so that the list of descriptors behaves circular queue. + */ +#define amdtp_stream_next_packet_desc(s, desc) \ + list_next_entry_circular(desc, &s->packet_descs_list, link) + static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) { return sfc & 1; |