usb_gadget_udc_start_locked(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb_gadget_udc_start_locked(9) — bestie edition 🎀

okay so this is a page straight out of the Kernel API Manual and honestly? it's a little cutie. it's giving "quietly important background character who actually runs everything." let's get into it ✨

🌸 NAME 🌸

usb_gadget_udc_start_locked — the one that tells the usb device controller to start up. that's it, that's the vibe. 💖

✨ SYNOPSIS ✨

int usb_gadget_udc_start_locked (struct usb_udc *udc );

🎀 ARGUMENTS 🎀

  • udc — the UDC that's getting started. the main character of this whole function, no cap. 👑

🦋 DESCRIPTION 🦋

so here's the tea: this call gets issued by the UDC Class driver when it's about to register a gadget driver to the device controller — and it happens before it calls the gadget driver's bind method. timing is everything, iykyk. ⏰

the whole point? it lets the controller stay powered off until it's strictly necessary for it to be powered on. lowkey a little energy-saving slay. 🔋✨

returns zero on success — and if it doesn't work out, it returns a negative errno. (so like, if you see a negative number, that's the ick, not a win. 😭)

⚠️ note bestie: the caller should acquire connect_lock before invoking this function. don't skip that part, fr fr. 🔒

🌈 SEE ALSO 🌈

the whole friend group, in order, exactly as listed, no gatekeeping:

and that's the whole page, bestie 🫶 this lil manual lives in ./drivers/usb/gadget/udc and it's dated October 2026 — go off, calendar icon. 📅💜 mwah, hope this helped!! 💋

📦 where this page comes from