ccw_device_set_offline(9)

💅 ccw_device_set_offline(9) 💅

Okay so welcome to the Kernel API Manual side of the group chat, bestie — today's main character is ccw_device_set_offline(9), and she is literally here to disable a ccw device for I/O. Periodt. 🎀

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💖 NAME 💖

ccw_device_set_offline - disable a ccw device for I/O. No cap, that's the whole name vibe. ✨

🌸 SYNOPSIS 🌸

int ccw_device_set_offline (struct ccw_device *cdev );

🦋 ARGUMENTS 🦋

• cdev — the target ccw device. Like, the device we're about to take offline, iykyk. 🫶

✨ DESCRIPTION ✨

So this function calls the driver's set_offline function for cdev, if that function is given, and then it disables cdev. That's it. She's simple, she's effective, she's iconic. 💅

🔥 RETURN 🔥

• 0 on success — slay, it worked. ✅
• A negative error value on failure — not slay, but at least you know. 😭

👑 CONTEXT 👑

Context check, bestie: enabled, and the ccw device lock is not held. 🧚

🌈 SEE ALSO 🌈

Kernel file ./drivers/s390/cio/device.c — go read, bestie, it's giving source material. 📚

• ccw_device_set_online(9)
• get_ccwdev_by_dev_id(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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Catch you later, bestie! Source/version: ./drivers/s390/cio; date: October 2026; page: ccw_device_set_offline(9) — mwah! 💖🎀