usb_init_urb(9)

✨ NAME ✨

okay so bestie, this is usb_init_urb from the Kernel API Manual, and it literally initializes a urb so that it can be used by a USB driver. no cap, that's the whole assignment. 🦋

🌸 SYNOPSIS 🌸

void usb_init_urb (struct urb *urb );

🎀 ARGUMENTS 🎀

• urb — pointer to the urb to initialize. yeah, that's the one you're handing over to get set up. 🫶

💖 DESCRIPTION 💖

okay so the main character job here: it initializes a urb so that the USB subsystem can use it properly. slay. ✨

if a urb is created with a call to usb_alloc_urb, it is not necessary to call this function. so don't do extra work for no reason, bestie.

only use this if you allocate the space for a struct urb on your own. that's the specific situation — you're doing the memory yourself, so this is your init moment. 👑

🚨 if you call this function, be careful when freeing the memory for your urb that it is no longer in use by the USB core. like, the USB core cannot still be touching it. that's a real warning, not a vibe.

💀 only use this function if you _really_ understand what you are doing. fr fr. this is not a "just try it and see" situation.

👑 SEE ALSO 👑

kernel file ./drivers/usb/core/urb.c — and here's the whole urb-adjacent friend group, all in section 9:

• usb_alloc_urb(9)
• usb_free_urb(9)
• usb_get_urb(9)
• usb_anchor_urb(9)
• usb_unanchor_urb(9)
• usb_pipe_type_check(9)
• usb_urb_ep_type_check(9)
• usb_submit_urb(9)
• usb_unlink_urb(9)
• usb_kill_urb(9)
• usb_poison_urb(9)
• usb_block_urb(9)
• usb_kill_anchored_urbs(9)
• usb_poison_anchored_urbs(9)
• usb_unpoison_anchored_urbs(9)
• usb_anchor_suspend_wakeups(9)
• usb_anchor_resume_wakeups(9)
• usb_wait_anchor_empty_timeout(9)
• usb_get_from_anchor(9)
• usb_scuttle_anchored_urbs(9)
• usb_anchor_empty(9)

xoxo, your USB bestie 💅 — this page lives under ./drivers/usb/core, dated October 2026, and it's the usb_init_urb(9) moment. 🎀✨