dwc2_hcd_qh_add(9)

💖 NAME 💖

okay so bestie, welcome to the Kernel API Manual page for dwc2_hcd_qh_add(9). This function is giving schedule-wrangler main character energy: it adds a QH to either the non periodic schedule or the periodic schedule if it is not already in the schedule. If the QH is already in the schedule, no action is taken. literally no action. not a single thing. 💅

✨ SYNOPSIS ✨

int dwc2_hcd_qh_add (struct dwc2_hsotg *hsotg , struct dwc2_qh *qh );

🎀 ARGUMENTS 🎀

• hsotg — the HCD state structure for the DWC OTG controller. iconic struct, no notes.
• qh — the QH to add. that's the whole assignment, bestie.

🌈 RETURN 🌈

0 if successful, negative error code otherwise. zero = slay; negative = the vibe check failed, but that's what the manpage says. 😭

🦋 SEE ALSO 🦋

the whole squad, fr fr:

• Kernel file ./drivers/usb/dwc2/hcd_queue.c
• dwc2_periodic_channel_available(9)
• dwc2_check_periodic_bandwidth(9)
• pmap_schedule(9)
• pmap_unschedule(9)
• dwc2_get_ls_map(9)
• dwc2_qh_print(9)
• dwc2_qh_schedule_print(9)
• dwc2_ls_pmap_schedule(9)
• dwc2_ls_pmap_unschedule(9)
• dwc2_hs_pmap_schedule(9)
• dwc2_hs_pmap_unschedule(9)
• dwc2_uframe_schedule_split(9)
• dwc2_uframe_schedule_hs(9)
• dwc2_uframe_schedule_ls(9)
• dwc2_uframe_schedule(9)
• dwc2_uframe_unschedule(9)
• dwc2_pick_first_frame(9)
• dwc2_do_reserve(9)
• dwc2_do_unreserve(9)
• dwc2_unreserve_timer_fn(9)
• dwc2_check_max_xfer_size(9)
• dwc2_schedule_periodic(9)
• dwc2_deschedule_periodic(9)
• dwc2_wait_timer_fn(9)
• dwc2_qh_init(9)
• dwc2_hcd_qh_create(9)
• dwc2_hcd_qh_free(9)
• dwc2_hcd_qh_unlink(9)
• dwc2_next_for_periodic_split(9)
• dwc2_next_periodic_start(9)
• dwc2_hcd_qtd_init(9)
• dwc2_hcd_qtd_add(9)

💖 sign-off: source/version ./drivers/usb/dwc2, dated October 2026, page dwc2_hcd_qh_add(9) — byeee bestie! 💖