stop_activity(9)

💅 stop_activity(9) — a page from the Kernel API Manual, bestie

okay so real talk, this one lives in the <pink>Kernel API Manual</pink> and it's a tiny little function that does a big dramatic thing. Let's get into it 💖

✨ NAME ✨

stop_activity — the function that shuts down udc endpoints 🛑

🌸 SYNOPSIS 🌸

void stop_activity (struct pxa_udc *udc );

that's it. that's the whole vibe. returns nothing, takes one thing. periodt.

🎀 ARGUMENTS 🎀

• udc — the udc device. that's the one and only thing you hand it, bestie 🫶

🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — stop_activity disables all udc endpoints. and when we say all, we mean all, like even the control endpoint is getting the door slammed on it 😭 no exceptions, no survivors, everyone's done.

then it reports a disconnect to the gadget user. so yeah, it's giving "we're so over" energy, but officially, in kernel form 💅

💜 SEE ALSO 💜

literally the whole friend group of pxa27x_udc is linked here, iykyk. they all live in the kernel file ./drivers/usb/gadget/udc/pxa27x_udc.c 👑

• is_match_usb_pxa(9), find_pxa_ep(9), update_pxa_ep_matches(9), pio_irq_enable(9), pio_irq_disable(9), udc_set_mask_UDCCR(9), udc_clear_mask_UDCCR(9), ep_write_UDCCSR(9)
• ep_count_bytes_remain(9), ep_is_empty(9), ep_is_full(9), epout_has_pkt(9), set_ep0state(9), ep0_idle(9), inc_ep_stats_reqs(9), inc_ep_stats_bytes(9)
• pxa_ep_setup(9), pxa_eps_setup(9), pxa_ep_alloc_request(9), pxa_ep_free_request(9), ep_add_request(9), ep_del_request(9), req_done(9)
• ep_end_out_req(9), ep0_end_out_req(9), ep_end_in_req(9), ep0_end_in_req(9), nuke(9)
• read_packet(9), write_packet(9), read_fifo(9), write_fifo(9), read_ep0_fifo(9), write_ep0_fifo(9)
• pxa_ep_queue(9), pxa_ep_dequeue(9), pxa_ep_set_halt(9), pxa_ep_fifo_status(9), pxa_ep_fifo_flush(9), pxa_ep_enable(9), pxa_ep_disable(9)
• dplus_pullup(9), pxa_udc_get_frame(9), pxa_udc_wakeup(9), should_enable_udc(9), should_disable_udc(9)
• pxa_udc_pullup(9), pxa_udc_vbus_session(9), pxa_udc_vbus_draw(9), pxa_udc_phy_event(9)
• udc_disable(9), udc_init_data(9), udc_enable(9), pxa27x_udc_start(9), pxa27x_udc_stop(9)
• handle_ep0_ctrl_req(9), handle_ep0(9), handle_ep(9), pxa27x_change_configuration(9), pxa27x_change_interface(9)
• irq_udc_suspend(9), irq_udc_resume(9), irq_udc_reconfig(9), irq_udc_reset(9), pxa_udc_irq(9)
• pxa_udc_probe(9), pxa_udc_remove(9), pxa_udc_suspend(9), pxa_udc_resume(9)

and that's the whole page, bestie 🧚 no cap, that was quick. shoutout to the <purple>./drivers/usb/gadget/udc</purple> crew and the <cyan>October 2026</cyan> date stamp for holding it down — catch you in the next manpage 💜✨🎀