usb_stop_hcd(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb_stop_hcd — the Kernel API Manual, bestie edition ✨

okay so we're in the Kernel API Manual today, and the star of the show is usb_stop_hcd(9). she's short, she's sweet, she's the one who turns the lights off 🕯️

🌸 NAME 🌸

usb_stop_hcd — literally just halt the HCD, no cap 🛑

🦋 SYNOPSIS 🦋

void usb_stop_hcd (struct usb_hcd *hcd );

that's it. that's the whole vibe check. she takes one pointer and returns nothing (void), periodt 💜

🎀 ARGUMENTS 🎀

  • hcd — the struct usb_hcd that has to be halted 🫶 like, the actual host controller thing you're putting to sleep. this is the one thing you gotta hand her.

✨ DESCRIPTION ✨

okay so here's what she does, and it's honestly iconic in how simple it is:

  • she stops the root-hub polling timer ⏰ — no more polling, we're done here
  • then she invokes the HCD's ->stop callback 🔥 — handing the actual shutdown off to the driver's own stop routine

that's the whole function. two things. very main character energy for such a tiny amount of code 💅 ngl, sometimes the smallest functions ate the hardest.

👑 SEE ALSO 👑

if you wanna go deeper (and you know you do, iykyk), the kernel file ./drivers/usb/core/hcd.c is where it all lives 💖 and here's the whole friend group, all present and accounted for:

like a whole group chat of USB core functions, and usb_stop_hcd is the one who says "okay guys, wrap it up" 😭🫶

reminder bestie: this page is straight out of ./drivers/usb/core, dated October 2026 📅✨ so go forth, halt that HCD, and slay the shutdown 💅💖🌷
📦 where this page comes from