static void async_midi_port_callback(struct fw_card *card, int rcode, void *data, size_t length, void *callback_data) { struct snd_fw_async_midi_port *port = callback_data; struct snd_rawmidi_substream *substream = ACCESS_ONCE(port->substream); /* This port is closed. */ if (substream == NULL) return; if (rcode == RCODE_COMPLETE) snd_rawmidi_transmit_ack(substream, port->consume_bytes); else if (!rcode_is_permanent_error(rcode)) /* To start next transaction immediately for recovery. */ port->next_ktime = ktime_set(0, 0); else /* Don't continue processing. */ port->error = true; port->idling = true; if (!snd_rawmidi_transmit_empty(substream)) schedule_work(&port->work); }
/** * snd_fw_transaction - send a request and wait for its completion * @unit: the driver's unit on the target device * @tcode: the transaction code * @offset: the address in the target's address space * @buffer: input/output data * @length: length of @buffer * @flags: use %FW_FIXED_GENERATION and add the generation value to attempt the * request only in that generation; use %FW_QUIET to suppress error * messages * * Submits an asynchronous request to the target device, and waits for the * response. The node ID and the current generation are derived from @unit. * On a bus reset or an error, the transaction is retried a few times. * Returns zero on success, or a negative error code. */ int snd_fw_transaction(struct fw_unit *unit, int tcode, u64 offset, void *buffer, size_t length, unsigned int flags) { struct fw_device *device = fw_parent_device(unit); int generation, rcode, tries = 0; generation = flags & FW_GENERATION_MASK; for (;;) { if (!(flags & FW_FIXED_GENERATION)) { generation = device->generation; smp_rmb(); /* node_id vs. generation */ } rcode = fw_run_transaction(device->card, tcode, device->node_id, generation, device->max_speed, offset, buffer, length); if (rcode == RCODE_COMPLETE) return 0; if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION)) return -EAGAIN; if (rcode_is_permanent_error(rcode) || ++tries >= 3) { if (!(flags & FW_QUIET)) dev_err(&unit->device, "transaction failed: %s\n", fw_rcode_string(rcode)); return -EIO; } msleep(ERROR_RETRY_DELAY_MS); } }
/** * snd_fw_transaction - send a request and wait for its completion * @unit: the driver's unit on the target device * @tcode: the transaction code * @offset: the address in the target's address space * @buffer: input/output data * @length: length of @buffer * * Submits an asynchronous request to the target device, and waits for the * response. The node ID and the current generation are derived from @unit. * On a bus reset or an error, the transaction is retried a few times. * Returns zero on success, or a negative error code. */ int snd_fw_transaction(struct fw_unit *unit, int tcode, u64 offset, void *buffer, size_t length) { struct fw_device *device = fw_parent_device(unit); int generation, rcode, tries = 0; for (;;) { generation = device->generation; smp_rmb(); /* node_id vs. generation */ rcode = fw_run_transaction(device->card, tcode, device->node_id, generation, device->max_speed, offset, buffer, length); if (rcode == RCODE_COMPLETE) return 0; if (rcode_is_permanent_error(rcode) || ++tries >= 3) { dev_err(&unit->device, "transaction failed: %s\n", rcode_string(rcode)); return -EIO; } msleep(ERROR_RETRY_DELAY_MS); } }