usb_block_urb(9)

✨ NAME ✨

usb_block_urb — reliably prevent further use of an URB

okay so bestie, this is usb_block_urb(9) from the Kernel API Manual. Translation: it's the routine that makes an URB stay down and stop trying to resubmit itself. iconic behavior, honestly 💅

🦋 SYNOPSIS 🦋

void usb_block_urb (struct urb *urb );

🎀 ARGUMENTS 🎀

• urb — pointer to the URB to be blocked, and yes bestie it may be NULL 🙈

💅 DESCRIPTION 💅

After the routine has run, attempts to resubmit the URB will fail with error -EPERM. So even if the URB's completion handler always tries to resubmit, it will not succeed, and the URB will become idle. that's the whole slay: no sneaky comeback resubmits, no cap 🫶

okay but fr fr, the URB must not be deallocated while this routine is running. not even a little. In particular, when a driver calls this routine, it must insure that the completion handler cannot deallocate the URB. this part is non-negotiable, bestie — protect the URB from deallocation while this runs 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/usb/core/urb.c — plus the whole squad of related calls, all with main character energy 👑

• usb_init_urb(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_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)

mwah 💋 that's the page, bestie. source/version: ./drivers/usb/core · date: October 2026 · manual: usb_block_urb(9) · periodt 🎀