vb2_discard_done(9)

💖 vb2_discard_done(9) 💖

okay bestie, welcome to the vb2_discard_done(9) page in the Kernel API Manual — we’re doing kernel videobuf2 lore today, and it’s lowkey iconic. This page is short, but the warning is highkey important.

🌸 NAME 🌸

vb2_discard_done — discard all buffers marked as DONE.

✨ SYNOPSIS ✨

void vb2_discard_done (struct vb2_queue *q );

🫶 ARGUMENTS 🫶

• q — pointer to struct vb2_queue with videobuf2 queue.

💅 DESCRIPTION 💅

This function is intended to be used with suspend/resume operations. It discards all 'done' buffers as they would be too old to be requested after resume.

⚠️ Bestie, read this twice: Drivers must stop the hardware and synchronize with interrupt handlers and/or delayed works before calling this function to make sure no buffer will be touched by the driver and/or hardware.

🔥 SEE ALSO 🔥

Kernel file: ./include/media/videobuf2-core.h — and here’s the whole squad, no skips:

• enum vb2_memory(9)
• struct vb2_mem_ops(9)
• struct vb2_plane(9)
• enum vb2_io_modes(9)
• enum vb2_buffer_state(9)
• struct vb2_buffer(9)
• struct vb2_ops(9)
• struct vb2_buf_ops(9)
• struct vb2_queue(9)
• vb2_queue_allows_cache_hints(9)
• vb2_plane_vaddr(9)
• vb2_plane_cookie(9)
• vb2_buffer_done(9)
• vb2_wait_for_all_buffers(9)
• vb2_core_querybuf(9)
• vb2_core_reqbufs(9)
• vb2_core_create_bufs(9)
• vb2_core_prepare_buf(9)
• vb2_core_remove_bufs(9)
• vb2_core_qbuf(9)
• vb2_core_dqbuf(9)
• vb2_core_streamon(9)
• vb2_core_streamoff(9)
• vb2_core_expbuf(9)
• vb2_core_queue_init(9)
• vb2_core_queue_release(9)
• vb2_queue_error(9)
• vb2_mmap(9)
• vb2_get_unmapped_area(9)
• vb2_core_poll(9)
• vb2_read(9)
• vb2_write(9)
• vb2_thread_fnc(9)
• vb2_thread_start(9)
• vb2_thread_stop(9)
• vb2_is_streaming(9)
• vb2_fileio_is_active(9)
• vb2_get_num_buffers(9)
• vb2_is_busy(9)
• vb2_get_drv_priv(9)
• vb2_set_plane_payload(9)
• vb2_get_plane_payload(9)
• vb2_plane_size(9)
• vb2_start_streaming_called(9)
• vb2_clear_last_buffer_dequeued(9)
• vb2_get_buffer(9)
• vb2_buffer_in_use(9)
• vb2_verify_memory_type(9)
• vb2_request_object_is_buffer(9)
• vb2_request_buffer_cnt(9)

that’s the whole page, bestie 🫶 — source/version ./include/media, date October 2026, page vb2_discard_done(9). mwah 💋✨