v4l2_pipeline_pm_put(9)

💅 v4l2_pipeline_pm_put(9) — the Kernel API Manual, but make it make sense

okay bestie, welcome to the Kernel API Manual page for v4l2_pipeline_pm_put(9) — yes that's the manual name, yes it's a mouthful, no we're not renaming it, it's iconic as is 🎀

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✨ NAME ✨

v4l2_pipeline_pm_put — the one that decreases the use count of a pipeline 💫

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🌸 SYNOPSIS 🌸

void v4l2_pipeline_pm_put (struct media_entity *entity );

that's it. that's the whole vibe. void, so it gives nothing back — it just takes 😌

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🦋 ARGUMENTS 🦋

• entity — the root entity of a pipeline. like, the main character of the pipeline. the one at the top. 👑

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🔥 DESCRIPTION 🔥

THIS FUNCTION IS DEPRECATED. DO NOT USE IN NEW DRIVERS. USE RUNTIME PM ON SUB-DEVICE DRIVERS INSTEAD. 😭🚨

fr fr, i need you to read that again. deprecated. do not use it in new drivers. the move is runtime PM on sub-device drivers, periodt. this is not a drill 💀

so here's what it actually does: it updates the use count of every entity in the pipeline, and then it powers the entities off. lights out. bye. 💤

this function is intended to be called in video node release — like, when you're closing up shop. it keeps track of the power status using struct media_entity.use_count, which is literally the field doing the bookkeeping 🧚

and a heads up, this is a matched set, okay? the use of this function should be paired with v4l2_pipeline_link_notify. they're a duo. a package deal. don't split them up, it's giving toxic breakup energy 🙈

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👀 SEE ALSO 👀

• Kernel file ./include/media/v4l2-mc.h — that's where the goods live, iykyk 📁
• v4l2_mc_create_media_graph(9)
• v4l_enable_media_source(9)
• v4l_disable_media_source(9)
• v4l2_create_fwnode_links_to_pad(9)
• v4l2_create_fwnode_links(9)
• v4l2_pipeline_pm_get(9) — the get to this put, the other half of the friendship bracelet 🫶
• v4l2_pipeline_link_notify(9) — the paired one, remember? 👯

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okay that's the whole page, you ate that 💅✨

little sign-off moment: this beauty comes to you from the source at ./include/media, dated October 2026, and it's page v4l2_pipeline_pm_put(9) of the Kernel API Manual. go forth, don't use deprecated calls, and stan runtime PM instead 🌈💖