usb_hcd_resume_root_hub(9)

💅 usb_hcd_resume_root_hub(9) 💅

okay so bestie, this little icon is straight out of the Kernel API Manual and it's basically the "hey king, wake up" button for a root hub. no cap, it's giving very specific kernel-core energy 🦋

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🌸 NAME 🌸

usb_hcd_resume_root_hub — called by HCD to resume its root hub 💖

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🦋 SYNOPSIS 🦋

void usb_hcd_resume_root_hub (struct usb_hcd *hcd );

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🎀 ARGUMENTS 🎀

• hcd — host controller for this root hub. that's the whole vibe: it's the controller this root hub belongs to ✨

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✨ DESCRIPTION ✨

so here's the tea 🫖 — the USB host controller calls this function when its root hub is suspended (with the remote wakeup feature enabled) and a remote wakeup request is received. like, the root hub is napping but remote wakeup is switched on, and then someone sends a remote wakeup request.

and what does this routine do? it submits a workqueue request to resume the root hub (that is, manage its downstream ports again). literally submitting the wake-up paperwork so the root hub can get back to handling its downstream ports. main character behavior, honestly 💅🔥

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💜 SEE ALSO 💜

the whole friend group is here, no one left out — Kernel file ./drivers/usb/core/hcd.c, ascii2desc(9), rh_string(9), usb_bus_init(9), usb_register_bus(9), usb_deregister_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_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) 🫶✨

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source/version vibes: ./drivers/usb/core, dated October 2026, and the page is still usb_hcd_resume_root_hub(9) — periodt, mwah 💋🎀🌈