usb_gadget_udc_stop_locked(9)

okay so bestie, this is page usb_gadget_udc_stop_locked(9) from the Kernel API Manual, and it’s lowkey the “we’re so done here” button for a USB device controller. ✨

🎀 NAME 🎀

usb_gadget_udc_stop_locked — tells usb device controller we don't need it anymore. Like, it’s the function that says “you can stop now, bestie” to the UDC. 💅

✨ SYNOPSIS ✨

void usb_gadget_udc_stop_locked (struct usb_udc *udc );

🫶 ARGUMENTS 🫶

• udc — the UDC that’s getting stopped.

🔥 DESCRIPTION 🔥

Here’s the tea: the UDC Class driver issues this call after calling the gadget driver’s unbind method. So unbind already happened, and then this comes through to stop the UDC. 🫡

The details are implementation specific, but it can go as far as powering off the UDC completely and disabling its data line pullups. Literally full shutdown energy, no cap. 💀

Caller should acquire connect lock before invoking this function. That’s a should from the docs, bestie, so don’t just vibe in there without it. 🔒

🌈 SEE ALSO 🌈

Kernel file ./drivers/usb/gadget/udc/core.c — and the whole reference squad is here, fr fr:

• struct usb_udc(9)
• usb_ep_set_maxpacket_limit(9)
• usb_ep_enable(9)
• usb_ep_disable(9)
• usb_ep_alloc_request(9)
• usb_ep_free_request(9)
• usb_ep_queue(9)
• usb_ep_dequeue(9)
• usb_ep_set_halt(9)
• usb_ep_clear_halt(9)
• usb_ep_set_wedge(9)
• usb_ep_fifo_status(9)
• usb_ep_fifo_flush(9)
• usb_gadget_frame_number(9)
• usb_gadget_wakeup(9)
• usb_gadget_set_remote_wakeup(9)
• usb_gadget_set_selfpowered(9)
• usb_gadget_clear_selfpowered(9)
• usb_gadget_vbus_connect(9)
• usb_gadget_vbus_draw(9)
• usb_gadget_vbus_disconnect(9)
• usb_gadget_connect(9)
• usb_gadget_disconnect(9)
• usb_gadget_deactivate(9)
• usb_gadget_activate(9)
• usb_gadget_giveback_request(9)
• gadget_find_ep_by_name(9)
• usb_gadget_check_config(9)
• usb_udc_vbus_handler(9)
• usb_gadget_udc_reset(9)
• usb_gadget_udc_start_locked(9)
• usb_gadget_udc_set_speed(9)
• usb_gadget_enable_async_callbacks(9)
• usb_gadget_disable_async_callbacks(9)
• usb_udc_release(9)
• usb_initialize_gadget(9)
• usb_add_gadget(9)
• usb_add_gadget_udc_release(9)
• usb_get_gadget_udc_name(9)
• usb_add_gadget_udc(9)
• usb_del_gadget(9)
• usb_del_gadget_udc(9)

cute sign-off time: this page’s source/version lane is ./drivers/usb/gadget/udc, dated October 2026, and the header title is usb_gadget_udc_stop_locked(9). periodt. 💖✨