hub_hc_release_resources(9)

🌸 NAME 🌸

hub_hc_release_resources — the function that clears resources used by the host controller, bestie. This is from the Kernel API Manual, and it's giving very "USB cleanup era" energy ✨

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🎀 SYNOPSIS 🎀

void hub_hc_release_resources (struct usb_device *udev );

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💅 ARGUMENTS 💅

• udev — pointer to the device being released. That's the USB device in question, okay? 🫶

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🦋 CONTEXT 🦋

Task context, and it might sleep 😴. So like, do not bring this to an interrupt-context party. It is not that girl.

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✨ DESCRIPTION ✨

Okay so this function releases the host controller resources in correct order before making any operation on resuming a USB device. The host controller resources allocated for devices in the tree should be released starting from the last USB device in the tree toward the root hub. Like, from the outer branches all the way back to the root — order matters, no cap. 🌈

This one is used only during resuming device when the USB device requires reinitialization — that is, when flag udev->reset_resume is set. Very specific vibe check, literally only then. 🔥

This call is synchronous, and it may not be used in an interrupt context. Periodt. Do not try it. It's not built for that 💀

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👑 SEE ALSO 👑

Kernel file ./drivers/usb/core/hub.c and all these iconic little references:

• usb_hub_set_port_power(9)
• usb_hub_clear_tt_buffer(9)
• usb_remove_device(9)
• usb_set_device_state(9)
• usb_disconnect(9)
• usb_enumerate_device_otg(9)
• usb_enumerate_device(9)
• usb_new_device(9)
• usb_deauthorize_device(9)
• get_port_ssp_rate(9)
• usb_root_hub_lost_power(9)
• usb_reset_and_verify_device(9)
• usb_reset_device(9)
• usb_queue_reset_device(9)
• usb_hub_find_child(9)
• usb_get_hub_port_acpi_handle(9)

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And that's the whole page, bestie 💖 This little manual page lives in ./drivers/usb/core, dated October 2026, and it's all about hub_hc_release_resources(9) — slay, go release those resources in the right order 🎀🦋🌸