hw_ep_flush(9)

💅 hw_ep_flush(9) — from the Kernel API Manual, bestie

okay so we're diving into hw_ep_flush(9) today and honestly? it's giving "small function, big responsibility." this is a kernel API manual page, and the whole thing is basically one glorious little one-liner function that flushes an endpoint fifo — and the vibes say execute without interruption, so like, do not interrupt it, periodt. 🎀

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✨ NAME ✨

hw_ep_flush — flush the endpoint fifo, and yes bestie, it executes without interruption 🔥

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🦋 SYNOPSIS 🦋

int hw_ep_flush (struct ci_hdrc *ci , int num , int dir );

there she is. three args, one int coming back at you. slay. ✨

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🌸 ARGUMENTS 🌸

• ci — the controller 💜 like, the whole struct ci_hdrc situation, the main character here
• num — the endpoint number 🔢 which endpoint we're talking about
• dir — the endpoint direction 🧭 which way it's facing

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🌈 DESCRIPTION 🌈

so what does it actually do? this function returns an error code. that's it, that's the whole description, no cap 😭 and yeah, ngl, the manpage is keeping it mysterious — but that's literally what it says, so we're not gonna invent extra lore. the function returns an error code, bestie. take it, love it, check it. 💅

also remember from the NAME section: this thing executes without interruption — so treat it with the respect it deserves, okay? 🙈

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👑 SEE ALSO 👑

this is the part where the page just. keeps. going. and we respect the hustle 🫶 kernel file ./drivers/usb/chipidea/udc.c, and then the whole friend group:

• hw_ep_bit(9)
• hw_device_state(9)
• hw_ep_disable(9)
• hw_ep_enable(9)
• hw_ep_get_halt(9)
• hw_ep_prime(9)
• hw_ep_set_halt(9)
• hw_port_is_high_speed(9)
• hw_test_and_clear_complete(9)
• hw_test_and_clear_intr_active(9)
• hw_test_and_clear_setup_guard(9)
• hw_test_and_set_setup_guard(9)
• hw_usb_set_address(9)
• hw_usb_reset(9)
• _usb_addr(9)
• _hardware_enqueue(9)
• free_pending_td(9)
• _hardware_dequeue(9)
• _ep_nuke(9)
• _gadget_stop_activity(9)
• isr_reset_handler(9)
• isr_get_status_complete(9)
• _ep_queue(9)
• isr_get_status_response(9)
• isr_setup_status_complete(9)
• isr_setup_status_phase(9)
• isr_tr_complete_low(9)
• isr_setup_packet_handler(9)
• isr_tr_complete_handler(9)
• ci_udc_start(9)
• udc_start(9)
• udc_stop(9)
• ci_hdrc_gadget_init(9)

like, that's the whole gc right there and they all ate 💖

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quick vibe check: everything above is literally what the page says — i'm not adding lore, i'm just being loud about it 💀

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and that's the page, bestie!! 🧚 this iconic little number comes to you from ./drivers/usb/chipidea, dated October 2026 ⭐ mwah, go flush those fifos responsibly 💜