drm_client_register(9)

✨ drm_client_register(9) ✨

okay bestie, welcome to the glow-up era of the Kernel API Manual 🎀 this one's drm_client_register(9) and it's lowkey the moment your DRM client goes from "just existing" to "actually on the list, actually doing stuff" 💅

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🌸 NAME 🌸

drm_client_register — register client 👑

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🦋 SYNOPSIS 🦋

void drm_client_register (struct drm_client_dev *client );

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💖 ARGUMENTS 💖

• client — the DRM client, obviously 💫 your main character struct.

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🌈 DESCRIPTION 🌈

so what this does: it adds the client to the drm_device client list, which is what activates its callbacks 🔥 like, no cap, this is the "you're in the group chat now" moment for your client.

🫶 heads up: client must be initialized by a call to drm_client_init first. no skipping steps, bestie.

and here's the part where you gotta be careful 😭 — after drm_client_register, it is no longer permissible to call drm_client_release directly (outside the unregister callback). instead, cleanup will happen automatically on driver unload ✨ iconic behaviour honestly, the kernel handles it for you.

also!! registering a client generates a hotplug event — which is the whole point, because it lets the client set up its display from pre-existing outputs 🖥️💅 but the catch: the client must have initialized its state to be able to handle the hotplug event successfully. so like, do your homework before you show up, fr fr 📚

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/drm_client.c overview(9)
• drm_client_init(9)
• drm_client_release(9)
• drm_client_buffer_delete(9)
• drm_client_buffer_vmap_local(9)
• drm_client_buffer_vunmap_local(9)
• drm_client_buffer_vmap(9)
• drm_client_buffer_vunmap(9)
• drm_client_buffer_create_dumb(9)
• drm_client_buffer_flush(9)

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and that's the whole vibe check bestie 🧚‍♀️💜 this little gem lives in ./drivers/gpu/drm, dated October 2026 — go forth and register responsibly, mwah 🍓✨