STRUCT FW_CDEV_EVENT_BUS_RESET(9)

💅 struct fw_cdev_event_bus_reset — Kernel API Manual, section 9 ✨

okay bestie, welcome to the Kernel API Manual (section 9), and today's main character is struct fw_cdev_event_bus_reset 🎀. this is the whole page, no skipping, we're eating every crumb 🍓

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🌸 NAME 🌸

struct fw_cdev_event_bus_reset — the event that gets sent when a bus reset happened ✨ literally the "hey girl the bus just reset" notification 💅

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🦋 SYNOPSIS 🦋

struct fw_cdev_event_bus_reset {
    __u64 closure;
    __u32 type;
    __u32 node_id;
    __u32 local_node_id;
    __u32 bm_node_id;
    __u32 irm_node_id;
    __u32 root_node_id;
    __u32 generation;
 };

that's the whole struct, look at her 👑 eight fields, all accounted for, no crumbs left behind 🫶

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💜 Members 💜

okay so every single field gets its moment, no member left on read 💖

• closure — see fw_cdev_event_common; you set this yourself with the FW_CDEV_IOC_GET_INFO ioctl 🔥
• type — see fw_cdev_event_common; this one is always FW_CDEV_EVENT_BUS_RESET periodt 💀
• node_id — the brand-new node ID of this node ⭐
• local_node_id — node ID of the local node, i.e. of the controller 👑
• bm_node_id — node ID of the bus manager 🧚
• irm_node_id — node ID of the iso resource manager 🌈
• root_node_id — node ID of the root node 🌸
• generation — the new bus generation, fresh out the oven 🍓

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✨ Description ✨

so like, this event shows up when the bus that the device belongs to goes through a bus reset 💫 it's carrying the tea about the new bus configuration — things like the new node ID for this device, the new root ID, and other stuff like that 🫶

⚠️ heads up bestie: if bm_node_id is 0xffff right after bus reset, it can be reread by an FW_CDEV_IOC_GET_INFO ioctl after bus manager selection was finished 👀 and ngl, kernels with ABI version < 4 do not set bm_node_id at all 😭 so don't come for her, she simply didn't fill that field in 💀

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🔥 SEE ALSO 🔥

all the siblings, the whole family reunion, every single one of them 🫶 (source: kernel file ./include/uapi/linux/firewire-cdev.h)

• struct fw_cdev_event_common(9)
• struct fw_cdev_event_response(9)
• struct fw_cdev_event_response2(9)
• struct fw_cdev_event_request(9)
• struct fw_cdev_event_request2(9)
• struct fw_cdev_event_request3(9)
• struct fw_cdev_event_iso_interrupt(9)
• struct fw_cdev_event_iso_interrupt_mc(9)
• struct fw_cdev_event_iso_resource(9)
• struct fw_cdev_event_phy_packet(9)
• struct fw_cdev_event_phy_packet2(9)
• union fw_cdev_event(9)
• struct fw_cdev_get_info(9)
• struct fw_cdev_send_request(9)
• struct fw_cdev_send_response(9)
• struct fw_cdev_allocate(9)
• struct fw_cdev_deallocate(9)
• struct fw_cdev_initiate_bus_reset(9)
• struct fw_cdev_add_descriptor(9)
• struct fw_cdev_remove_descriptor(9)
• struct fw_cdev_create_iso_context(9)
• struct fw_cdev_set_iso_channels(9)
• struct fw_cdev_iso_packet(9)
• struct fw_cdev_queue_iso(9)
• struct fw_cdev_start_iso(9)
• struct fw_cdev_stop_iso(9)
• struct fw_cdev_flush_iso(9)
• struct fw_cdev_get_cycle_timer(9)
• struct fw_cdev_get_cycle_timer2(9)
• struct fw_cdev_allocate_iso_resource(9)
• struct fw_cdev_send_stream_packet(9)
• struct fw_cdev_send_phy_packet(9)
• struct fw_cdev_receive_phy_packets(9)

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💌 and that's the whole page bestie, we ate and left zero crumbs 💅 this iconic little number came to you from <pink>./include/uapi/linux</pink>, dated October 2026, and yes the title is still struct fw_cdev_event_bus_reset(9) because she's the moment, she's the main character, periodt 👑✨🦋