WaitForDoorbellAck(9)

okay so you're looking at WaitForDoorbellAck(9) from the Kernel API Manual, and bestie, it's giving "tiny function, very specific job, knows exactly what it is." 💅✨

🎀 NAME 🎀

WaitForDoorbellAck — wait for IOC doorbell handshake acknowledge 🦋

💖 SYNOPSIS 💖

int WaitForDoorbellAck (MPT_ADAPTER *ioc , int howlong , int sleepFlag
);

✨ ARGUMENTS ✨

• ioc — pointer to MPT_ADAPTER structure 🫶
• howlong — how long to wait (in seconds) ⏳
• sleepFlag — specifies whether the process can sleep 😴

💫 DESCRIPTION 💫

okay so this routine literally waits for the IOC doorbell handshake ACKnowledge — and the glow-up detail is that it waits up to ~2 seconds max. 🔥 The ack is indicated by the IOP_DOORBELL_STATUS bit in its IntStatus register being clear. slay, that's the whole vibe check. 🌸

It returns a negative value on failure, else the wait loop count. no cap, that's the return situation. 💜

bestie, remember: ~2 seconds max is the ceiling here, and a negative return means it did not go off. periodt. 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/message/fusion/mptbase.c — and the whole friend group is: mpt_get_cb_idx(9), mpt_is_discovery_complete(9), mpt_remove_dead_ioc_func(9), mpt_fault_reset_work(9), mpt_interrupt(9), mptbase_reply(9), mpt_register(9), mpt_deregister(9), mpt_event_register(9), mpt_event_deregister(9), mpt_reset_register(9), mpt_reset_deregister(9), mpt_device_driver_register(9), mpt_device_driver_deregister(9), mpt_get_msg_frame(9), mpt_put_msg_frame(9), mpt_put_msg_frame_hi_pri(9), mpt_free_msg_frame(9), mpt_add_sge(9), mpt_add_sge_64bit(9), mpt_add_sge_64bit_1078(9), mpt_add_chain(9), mpt_add_chain_64bit(9), mpt_send_handshake_request(9), mpt_host_page_access_control(9), mpt_host_page_alloc(9), mpt_verify_adapter(9), mpt_get_product_name(9), mpt_mapresources(9), mpt_attach(9), mpt_detach(9), mpt_suspend(9), mpt_resume(9), mpt_do_ioc_recovery(9), mpt_detect_bound_ports(9), mpt_adapter_disable(9), mpt_adapter_dispose(9), MptDisplayIocCapabilities(9), MakeIocReady(9), mpt_GetIocState(9), GetIocFacts(9), GetPortFacts(9), SendIocInit(9), SendPortEnable(9), mpt_alloc_fw_memory(9), mpt_free_fw_memory(9), mpt_do_upload(9), mpt_downloadboot(9), KickStart(9), mpt_diag_reset(9), SendIocReset(9), initChainBuffers(9), PrimeIocFifos(9), mpt_handshake_req_reply_wait(9), WaitForDoorbellInt(9), WaitForDoorbellReply(9), GetLanConfigPages(9), mptbase_sas_persist_operation(9), GetIoUnitPage2(9), mpt_GetScsiPortSettings(9), mpt_readScsiDevicePageHeaders(9), mpt_inactive_raid_list_free(9), mpt_inactive_raid_volumes(9), mpt_raid_phys_disk_pg0(9), mpt_raid_phys_disk_get_num_paths(9), mpt_raid_phys_disk_pg1(9), mpt_findImVolumes(9), SendEventNotification(9), SendEventAck(9), mpt_config(9), mpt_ioc_reset(9), procmpt_create(9), procmpt_destroy(9), mpt_print_ioc_summary(9), mpt_set_taskmgmt_in_progress_flag(9), mpt_clear_taskmgmt_in_progress_flag(9), mpt_halt_firmware(9), mpt_SoftResetHandler(9), mpt_Soft_Hard_ResetHandler(9), mpt_HardResetHandler(9), ProcessEventNotification(9), mpt_fc_log_info(9), mpt_spi_log_info(9), mpt_sas_log_info(9), mpt_iocstatus_info_config(9), mpt_iocstatus_info(9), fusion_init(9), fusion_exit(9) 🌟

mwah 💖 this iconic little page lives in ./drivers/message/fusion, dated October 2026, and it's literally WaitForDoorbellAck(9) — ate and left no crumbs. 🎀👑