STRUCT FW_CDEV_EVENT_ISO_RESOURCE(9)

💅 STRUCT FW_CDEV_EVENT_ISO_RESOURCE 💅

okay bestie, welcome to the fw_cdev_event_iso_resource page in the Kernel API Manual — yes it's giving "firewire isochronous resource allocation" and yes it's iconic in a very specific niche way 🎀

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✨ NAME ✨

struct fw_cdev_event_iso_resource — iso resources were allocated or freed 🦋

Like, that's literally it. Your isochronous resources got (de)allocated and this struct is the receipt, no cap 💖

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🌸 SYNOPSIS 🌸

struct fw_cdev_event_iso_resource {
    __u64 closure;
    __u32 type;
    __u32 handle;
    __s32 channel;
    __s32 bandwidth;
 };

look at her. five fields. flawless. we stan a compact struct 👑

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💜 Members 💜

• closure — see fw_cdev_event_common; this one's set by the FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl. iykyk 🫶
• type — it's either FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED. pick a lane, king 💅
• handle — the reference you use to deallocate a resource you already allocated. think of it as the little claim ticket for your resource 🎀
• channel — the isochronous channel that was (de)allocated, if any. conditional queen 🌈
• bandwidth — the bandwidth allocation units that were (de)allocated, if any. also conditional, also serving ✨

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🔥 Description 🔥

so an FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event gets sent after an isochronous resource was allocated at the IRM. and here's the thing bestie — you have to check channel and bandwidth yourself to see whether the allocation actually succeeded 👀 like the event is not gonna tell you "slay, it worked", you gotta vibe check it 🧚

an FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event gets sent after an isochronous resource was deallocated at the IRM. it's also sent when automatic reallocation after a bus reset failed — yeah, that one's a little 💀 ngl

channel is <0 if no channel was (de)allocated or if reallocation failed. bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed. so like, those zero/negative values are the "no thoughts head empty" signal, not a success 🚩

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🦋 SEE ALSO 🦋

the whole friend group came through, bestie. every single one:

• Kernel file ./include/uapi/linux/firewire-cdev.h
• struct fw_cdev_event_common(9)
• struct fw_cdev_event_bus_reset(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_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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okay that's the whole page, go forth and allocate responsibly 🫶✨

xoxo, your girl signing off — this one lives in ./include/uapi/linux, dated October 2026, and it's filed under struct fw_c...iso_resource(9) because the header line had to be dramatic about it 💅🎀 keep slaying, bestie 💖