drm_invalid_op(9)

💅 drm_invalid_op — the "nope, we're not doing that anymore" ioctl, from the Kernel API Manual bestie

okay so picture this: you're a kernel function whose whole entire job is to say no. iconic behavior honestly. this is drm_invalid_op, and she is serving pure rejection with zero apologies 🎀

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✨ SYNOPSIS ✨

int drm_invalid_op (struct drm_device *dev , void *data , struct
       drm_file *file_priv );

like, look at her. three args, one job, absolutely no chill 💅

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🌸 ARGUMENTS 🌸

• dev — the DRM device this ioctl is happening on
• data — the data pointer for the ioctl
• file_priv — the DRM file for the ioctl call

(does she actually do anything with these? bestie. no. but they're there, and that's what counts 🫶)

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🔥 DESCRIPTION 🔥

so this is a no-op implementation for drm ioctls, and before you come for her, hear me out — she's actually useful for deprecated functionality where we really don't want userspace calling the ioctl anymore. like, ever. not even a little bit. 💀

this is exactly the situation with old ums interfaces for drivers that transitioned to kms gradually and so kept the old legacy tables hanging around. you know how it is — the glow-up was a process, not a moment ✨

and real talk: this only applies to radeon and i915 kms drivers. other drivers shouldn't need to use this function at all. no cap. 🙅‍♀️

the vibe check: she always fails with a return value of -EINVAL. every single time. that's the whole personality. she's not broken, she's deliberate. periodt. 💅

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👑 SEE ALSO 👑

• Kernel file ./drivers/gpu/drm/drm_ioctl.c — specifically the getunique and setversion story(9)
• drm_noop(9)
• driver specific ioctls(9)
• drm_ioctl(9)
• drm_ioctl_flags(9)

go read those if you want the full lore, iykyk 🌈

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mwah 💖 that's the whole page! brought to you straight out of ./drivers/gpu/drm, dated October 2026, in the Kernel API Manual. now go forth and return -EINVAL with pride, bestie — you're literally doing exactly what you were made for 🌸🦋💜