get_ccwdev_by_dev_id(9)

💅 get_ccwdev_by_dev_id(9) — like, the Kernel API Manual edition 🎀

okay bestie, buckle up, because this one is literally the "find my device" of the ccw bus 🌸

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✨ NAME ✨

get_ccwdev_by_dev_id — obtain device from a ccw device id 🫶

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🦋 SYNOPSIS 🦋

struct ccw_device * get_ccwdev_by_dev_id (struct ccw_dev_id *dev_id );

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🎀 ARGUMENTS 🎀

• dev_id — the id of the device to be searched 🔍 that's it, that's the whole input, she's lowkey minimal

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💖 DESCRIPTION 💖

So this function searches all devices attached to the ccw bus for a device matching dev_id. Like, every single one. She's thorough. no cap, she is going to look at all of them until she finds her match ✨

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👑 RETURN 👑

If a device is found, its reference count is increased and it's returned 💫 — yes, she hands it back to you with a little extra refcount, that's the whole vibe.

Else, NULL is returned 💀 (and if you don't vibe-check that NULL, that's on you, not her).

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🌈 SEE ALSO 🌈

Kernel file ./drivers/s390/cio/device.c — that's where she lives, main character address fr fr 🏠

• ccw_device_set_offline(9)
• ccw_device_set_online(9)
• ccw_purge_blacklisted(9)
• io_subchannel_sch_event(9)
• ccw_device_wait_idle(9)
• get_ccwdev_by_busid(9)
• ccw_driver_register(9)
• ccw_driver_unregister(9)
• ccw_device_sched_todo(9)
• ccw_device_siosl(9)

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ok that's the whole page bestie, go forth and find your devices 💅

and that's a wrap, mwah 💋 — this one's chillin' in ./drivers/s390/cio, October 2026, brought to you by the get_ccwdev_by_dev_id(9) girlies themselves 🧚‍♀️⭐