usb_hub_find_child(9)

💅 usb_hub_find_child — kernel API manual, bestie edition 🎀

okay so like, this is the manual page for usb_hub_find_child(9) from the Kernel API Manual, and honestly? it's giving "small function, big main character energy." let's get into it ✨

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✨ NAME ✨

usb_hub_find_child — Get the pointer of child device attached to the port which is specified by @port1. no cap, that's literally the whole job 🫶

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🌸 SYNOPSIS 🌸

struct usb_device * usb_hub_find_child (struct usb_device *hdev , int port1 );

look at her. one function, two params, zero drama 💅

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🦋 ARGUMENTS 🦋

• hdev — the USB device belonging to the usb hub. like, this is the hub in question, the mother ship, the one we're asking about 🏠
• port1 — port num to indicate which port the child device is attached to. yes it's literally a port number, it tells you which port the baby device is plugged into 🔌

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💖 DESCRIPTION 💖

USB drivers call this function to get hub's child device pointer. that's it, that's the vibe. you hand it the hub and a port number, it hands you back the pointer to the child device chillin' on that port. iconic behavior, honestly 🌈

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⭐ RETURN ⭐

• NULL if input param is invalid 😭 (vibe check failed)
• child's usb_device pointer if non-NULL 💖 (vibe check passed, slay)

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💀 SEE ALSO 💀

Kernel file ./drivers/usb/core/hub.c — and the whole friend group, fr fr:

• 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)
• hub_hc_release_resources(9)
• usb_reset_and_verify_device(9)
• usb_reset_device(9)
• usb_queue_reset_device(9)
• usb_get_hub_port_acpi_handle(9)

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and that's the page bestie!! 🧚 source: ./drivers/usb/core, dated October 2026 — catch you in the next port, mwah 💜🍓