ccw_device_wait_idle(9)

💅 ccw_device_wait_idle(9) — the Kernel API Manual page, bestie ✨

Okay so this is a page straight outta the Kernel API Manual, and it is literally about busy-waiting for a device to become idle. Iconic behavior, no cap. 🫶

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🌸 NAME 🌸

ccw_device_wait_idle — busy wait for device to become idle. That's the whole vibe check. 💖

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✨ SYNOPSIS ✨

void ccw_device_wait_idle (struct ccw_device *cdev );

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🎀 ARGUMENTS 🎀

• cdev — the ccw device. That's it, that's the argument, periodt. 💅

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🦋 DESCRIPTION 🦋

Poll until activity control is zero, meaning no function or data transfer is pending/active. Bestie, it is literally sitting there checking until everything is chill. ⭐

Called with the device lock being held. Lowkey important: the device lock is being held when this happens, so don't act surprised. 🔥

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🌈 SEE ALSO 🌈

Kernel file ./drivers/s390/cio/device.c — and these absolute icons:

• ccw_device_set_offline(9)
• ccw_device_set_online(9)
• get_ccwdev_by_dev_id(9)
• ccw_purge_blacklisted(9)
• io_subchannel_sch_event(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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💖 Cute little sign-off, bestie: this page came from ./drivers/s390/cio, dated October 2026, and it's literally ccw_device_wait_idle(9). Mwah! 🫶✨