v4l2_device_mask_call_all(9)

💅 v4l2_device_mask_call_all(9) — the Kernel API Manual moment

okay so picture this: you're in the Kernel API Manual, section 9, and you've got a v4l2_device with a whole little friend group of subdevices, and you only wanna talk to some of them. bestie, that's literally what this function is for. no cap. 🫶

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✨ NAME ✨

v4l2_device_mask_call_all — calls the specified operation for all subdevices where a group ID matches a specified bitmask. it's giving "selective group chat" energy 🎀

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🌸 SYNOPSIS 🌸

v4l2_device_mask_call_all (v4l2_dev , grpmsk , o , f , args... );

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🦋 ARGUMENTS 🦋

• v4l2_dev — the struct v4l2_device that owns the sub-devices you're about to iterate over. it's the main character here, we're just visiting its house. 🏠
• grpmsk — the bitmask that gets checked against struct v4l2_subdev->grp_id, i.e. the group ID that has to match. and listen — use 0 to match them all. everybody's invited at that point, periodt. 🔥
• o — the name of the element inside struct v4l2_subdev_ops that contains f. each element in there groups together a set of operation functions, so this is basically "which bucket are we picking from". 🪣
• f — the operation function that actually gets called if cond matches. the operation functions are defined in groups, according to each element at struct v4l2_subdev_ops. it's the actual errand. 💫
• args — the arguments for f. feed the function, bestie. 🍓

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💜 DESCRIPTION 💜

Ignore any errors.

(no fr that's it. that's the whole description. we simply do not perceive them. 🙈)

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⭐ NOTE ⭐

subdevs cannot be added or deleted while walking the subdevs list. so don't be out here editing the group chat mid-scroll, bestie — that's not the vibe and it's not allowed. 💀

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🌈 SEE ALSO 🌈

the whole extended universe, and we're linking all of it because we're thorough like that:

• Kernel file ./include/media/v4l2-device.h
• struct v4l2_device(9)
• v4l2_device_get(9)
• v4l2_device_put(9)
• v4l2_device_register(9)
• v4l2_device_set_name(9)
• v4l2_device_disconnect(9)
• v4l2_device_unregister(9)
• v4l2_device_register_subdev(9)
• v4l2_device_unregister_subdev(9)
• __v4l2_device_register_subdev_nodes(9)
• v4l2_device_register_subdev_nodes(9)
• v4l2_device_register_ro_subdev_nodes(9)
• v4l2_subdev_notify(9)
• v4l2_device_supports_requests(9)
• v4l2_device_for_each_subdev(9)
• __v4l2_device_call_subdevs_p(9)
• __v4l2_device_call_subdevs(9)
• __v4l2_device_call_subdevs_until_err_p(9)
• __v4l2_device_call_subdevs_until_err(9)
• v4l2_device_call_all(9)
• v4l2_device_call_until_err(9)
• v4l2_device_mask_call_until_err(9)
• v4l2_device_has_op(9)
• v4l2_device_mask_has_op(9)

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and that's the whole page, bestie!! 🧚 from ./include/media, dated October 2026, version v4l2_device_mask_call_all(9) — stay masked, stay iconic, and remember: 0 matches everybody. mwah 💖✨👑