usb_deregister_bus(9)

💅 usb_deregister_bus (9) — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual, section 9 🎀. Today's main character is usb_deregister_bus — the function that says "girl, you're done here" to a USB host controller 👑.

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🌸 NAME 🌸

usb_deregister_bus — deregisters the USB host controller 💅

✨ SYNOPSIS ✨

void usb_deregister_bus (struct usb_bus *bus );

like, that's the whole signature. no return value, no drama, just void and vibes 🦋

🫶 ARGUMENTS 🫶

• bus — pointer to the bus to deregister. yes queen, that's the one you're yeeting out of the system 🙈

⏰ CONTEXT ⏰

task context, and — important — might sleep 😴. so do NOT call this from somewhere that can't handle a lil nap, iykyk. fr fr, respect the sleep.

💖 DESCRIPTION 💖

so what does it actually do? two iconic things:

• recycles the bus number ♻️ (that number is free real estate for the next bus now)
• unlinks the controller from usbcore data structures so that it won't be seen by scanning the bus list 🚫👀

basically the controller gets quietly removed from the group chat so nobody scanning the bus list is gonna find it anymore. lowkey ghosting, but make it kernel-level 💀✨

🔥 SEE ALSO 🔥

Kernel file ./drivers/usb/core/hcd.c — that's the source file this whole situation lives in 🧚 plus, bestie, a whole friend group of related reads:

• ascii2desc(9)
• rh_string(9)
• usb_bus_init(9)
• usb_register_bus(9)
• register_root_hub(9)
• usb_calc_bus_time(9)
• usb_hcd_link_urb_to_ep(9)
• usb_hcd_check_unlink_urb(9)
• usb_hcd_unlink_urb_from_ep(9)
• usb_hcd_giveback_urb(9)
• usb_hcd_alloc_bandwidth(9)
• usb_hcd_reset_endpoint(9)
• usb_alloc_streams(9)
• usb_free_streams(9)
• usb_hcd_resume_root_hub(9)
• usb_bus_start_enum(9)
• usb_hcd_irq(9)
• usb_hc_died(9)
• usb_create_shared_hcd(9)
• usb_create_hcd(9)
• usb_stop_hcd(9)
• usb_add_hcd(9)
• usb_remove_hcd(9)

like, that's the whole USB HCD cinematic universe 🌈 go read usb_register_bus(9) if you want the before-and-after, it's giving sequel energy 🎬

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and that's the page, bestie! 🫶 mwah 💋

this little gem comes to you from ./drivers/usb/core (the source/version, yes she lives there 🏡) and it's dated October 2026 ⭐ — so mark your calendar, screenshot it, put it on the fridge, periodt 💅🎀