STRUCT MEDIA_PIPELINE_WALK(9)

💖 struct media_pipeline_walk(9) 💖

okay bestie, welcome to the Kernel API Manual — we're looking at the state that the media pipeline traversal algorithm uses. literally just the state struct, no cap. 🫶

✨ NAME ✨

struct media_pipeline_walk — state used by the media pipeline traversal algorithm. that's the whole name line, bestie: it's the lil state bundle for traversal. 💅

🦋 SYNOPSIS 🦋

here's the struct, exact, do not touch the fields unless you're supposed to:

       struct media_pipeline_walk {
           struct media_device *mdev;
           struct {
             unsigned int size;
             int top;
             struct media_pipeline_walk_entry *entries;
           } stack;
        };

that's the shape. the vibe check passed. ✅

🧵 Members 🧵

• mdev — the media device. main character device energy.
• stack — the depth-first search stack. yes, DFS stack, we love a traversal moment. 🌸
  • stack.size — number of allocated entries in stack.entries. it's the size field, periodt.
  • stack.top — index of the top stack entry. it's -1 if the stack is empty, so -1 is the empty-stack vibe, not a bug. 😭
  • stack.entries — stack entries. the actual entries field, right there.

🌈 SEE ALSO 🌈

Kernel file ./drivers/media/mc/mc-entity.c — and the squad you should also check:

• dev_dbg_obj(9)
• media_entity_has_pad_interdep(9)
• media_graph_walk_init(9)
• media_graph_walk_cleanup(9)
• struct media_pipeline_walk_entry(9)

iykyk, go read those next. 🫶

that's the whole page, bestie 💖 source/version: ./drivers/media/mc; date: October 2026; page: struct media_pipeline_walk(9). mwah, slay. 🎀✨