device_delay_show(9)

💅 device_delay_show(9) — the missing-delay device thingy

okay so this is device_delay_show(9), from the Kernel API Manual, and it's literally the function that tells you about a device's missing delay. bestie, it's a sysfs show callback, it's giving read-only icon energy, let's get into it 💖

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✨ NAME ✨

device_delay_show — device missing delay 🫶

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🌸 SYNOPSIS 🌸

ssize_t device_delay_show (struct device *cdev , struct device_attribute
*attr , char *buf );

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🎀 ARGUMENTS 🎀

• cdev — pointer to the embedded class device 👑
• attr — ? ... yeah. that's literally all the docs give us. the manpage said ? and honestly? same vibe. no cap, that's what's written 🙈
• buf — the buffer that gets returned 💌

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🦋 DESCRIPTION 🦋

so this one exists for firmware implementation, specifically for debouncing device removal events ✨ (the original spells it "deboucing" but you get the vibe, it's debounce-y).

it's a sysfs 'read-only' shost attribute. periodt. 💅

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🧚 SEE ALSO 🧚

the kernel file ./drivers/scsi/mpt3sas/mpt3sas_ctl.c and, like, a whole friend group of functions — no seriously, the entire squad is here, i'm not skipping a single one 🫶:

• enum block_state(9)
• _ctl_display_some_debug(9)
• mpt3sas_ctl_done(9)
• _ctl_check_event_type(9)
• mpt3sas_ctl_add_to_event_log(9)
• mpt3sas_ctl_event_callback(9)
• _ctl_verify_adapter(9)
• mpt3sas_ctl_pre_reset_handler(9)
• mpt3sas_ctl_clear_outstanding_ioctls(9)
• mpt3sas_ctl_reset_done_handler(9)
• _ctl_fasync(9)
• _ctl_poll(9)
• _ctl_set_task_mid(9)
• _ctl_send_mctp_passthru_req(9)
• _ctl_do_mpt_command(9)
• _ctl_getiocinfo(9)
• _ctl_eventquery(9)
• _ctl_eventenable(9)
• _ctl_eventreport(9)
• _ctl_do_reset(9)
• _ctl_btdh_search_sas_device(9)
• _ctl_btdh_search_pcie_device(9)
• _ctl_btdh_search_raid_device(9)
• _ctl_btdh_mapping(9)
• _ctl_diag_capability(9)
• _ctl_diag_get_bufftype(9)
• _ctl_diag_register_2(9)
• mpt3sas_enable_diag_buffer(9)
• _ctl_diag_register(9)
• _ctl_diag_unregister(9)
• _ctl_diag_query(9)
• mpt3sas_send_diag_release(9)
• _ctl_diag_release(9)
• _ctl_diag_read_buffer(9)
• _ctl_addnl_diag_query(9)
• _ctl_enable_diag_sbr_reload(9)
• _ctl_compat_mpt_command(9)
• _ctl_ioctl_main(9)
• _ctl_get_mpt_mctp_passthru_adapter(9)
• mpt3sas_get_device_count(9)
• _ctl_ioctl(9)
• _ctl_mpt2_ioctl(9)
• _ctl_ioctl_compat(9)
• _ctl_mpt2_ioctl_compat(9)
• version_fw_show(9)
• version_bios_show(9)
• version_mpi_show(9)
• version_product_show(9)
• version_nvdata_persistent_show(9)
• version_nvdata_default_show(9)
• board_name_show(9)
• board_assembly_show(9)
• board_tracer_show(9)
• io_delay_show(9)
• fw_queue_depth_show(9)
• host_sas_address_show(9)
• logging_level_show(9)
• fwfault_debug_show(9)
• ioc_reset_count_show(9)
• reply_queue_count_show(9)
• BRM_status_show(9)
• host_trace_buffer_size_show(9)
• host_trace_buffer_show(9)
• host_trace_buffer_enable_show(9)
• diag_trigger_master_show(9)
• diag_trigger_master_store(9)
• diag_trigger_event_show(9)
• diag_trigger_event_store(9)
• diag_trigger_scsi_show(9)
• diag_trigger_scsi_store(9)
• diag_trigger_mpi_show(9)
• diag_trigger_mpi_store(9)
• drv_support_bitmap_show(9)
• enable_sdev_max_qd_show(9)
• enable_sdev_max_qd_store(9)
• sas_address_show(9)
• sas_device_handle_show(9)
• sas_ncq_prio_supported_show(9)
• sas_ncq_prio_enable_show(9)
• mpt3sas_ctl_init(9)
• mpt3sas_ctl_release(9)
• mpt3sas_ctl_exit(9)

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⭐ the sign-off ⭐

this little page lives in ./drivers/scsi/mpt3sas, and it was stamped October 2026 — so yeah, it's dated in the future, main character energy fr fr, we don't question it 💜✨

go read your device's delay bestie, ily, bye! 🎀🔥