usb_disable_endpoint(9)

✨ usb_disable_endpoint ✨

okay bestie, gather round, because today we're looking at usb_disable_endpoint(9) from the Kernel API Manual — yes it's a real function, yes it's from the kernel, and yes it's lowkey iconic 🎀

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🌸 NAME 🌸

usb_disable_endpoint — Disable an endpoint by address 💅

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🦋 SYNOPSIS 🦋

void usb_disable_endpoint (struct usb_device *dev , unsigned int epaddr
, bool reset_hardware );

like, that's the whole signature, no cap ✨

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💖 ARGUMENTS 💖

• dev — the device whose endpoint is being disabled. it's giving "who is this about" energy 🫶
• epaddr — the endpoint's address. Endpoint number for output, endpoint number + USB_DIR_IN for input. so like, output = just the number, input = number + USB_DIR_IN, iykyk 🌈
• reset_hardware — flag to erase any endpoint state stored in the controller hardware. yes bestie, it wipes the hardware's memory of that endpoint 🧚

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🔥 DESCRIPTION 🔥

So what does it actually do? It disables the endpoint for URB submission and nukes all pending URBs 💀 like, not gently, nukes them.

And if reset_hardware is set, it also deallocates hcd/hardware state for the endpoint — clearing both ep_in and ep_out pointers for bidirectional non-ep0 control endpoints. that's the main character move right there 👑

ok fr fr, note the detail: ep_in AND ep_out both get cleared, and it's specifically for bidirectional non-ep0 control endpoints. don't forget that part, it's important 💜

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🍓 SEE ALSO 🍓

Kernel file ./drivers/usb/core/message.c — plus a whole friend group of functions you should also go check out:

• usb_control_msg(9)
• usb_control_msg_send(9)
• usb_control_msg_recv(9)
• usb_interrupt_msg(9)
• usb_bulk_msg(9)
• usb_bulk_msg_killable(9)
• usb_sg_init(9)
• usb_sg_wait(9)
• usb_sg_cancel(9)
• usb_get_descriptor(9)
• usb_get_string(9)
• usb_string(9)
• usb_cache_string(9)
• usb_get_status(9)
• usb_clear_halt(9)
• usb_reset_endpoint(9)
• usb_disable_interface(9)
• usb_disable_device(9)
• usb_enable_endpoint(9)
• usb_enable_interface(9)
• usb_set_interface(9)
• usb_reset_configuration(9)
• usb_set_wireless_status(9)
• usb_driver_set_configuration(9)
• cdc_parse_cdc_header(9)

like yes that's a lot of friends but they're all valid, go say hi 🦋

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and that's the whole page, bestie, you ate it up 💅 this one lives in ./drivers/usb/core, dated October 2026, and it's version-stamped usb_disable_endpoint(9) — that's the source, the version and the date, all accounted for, periodt 🌟 💖