ccw_driver_register(9)

💅 ccw_driver_register — a Kernel API Manual moment

okay so bestie, welcome to the ccw_driver_register(9) page 🎀 this is from the Kernel API Manual and honestly it's giving "short but iconic" ✨

---

🌸 NAME 🌸

ccw_driver_register — register a ccw driver 🦋

✨ SYNOPSIS ✨

int ccw_driver_register (struct ccw_driver *cdriver );

🫶 ARGUMENTS 🫶

• cdriver — the driver you're registering, like the main character of this whole operation 👑

💖 DESCRIPTION 💖

so what does it actually do? honestly not much, and that's the vibe 💅 this function is mainly a wrapper around driver_register — that's it, that's the whole lore. no cap, it's just doing the handoff for you 🧚

🔥 RETURN 🔥

• 0 on success — we love a win 🎉
• a negative error value on failure — not the slay we wanted 😭

🌈 SEE ALSO 🌈

first up, the kernel file where the magic lives: ./drivers/s390/cio/device.c 📁 and then the whole friend group:

• 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)
• ccw_device_wait_idle(9)
• get_ccwdev_by_busid(9)
• ccw_driver_unregister(9)
• ccw_device_sched_todo(9)
• ccw_device_siosl(9)

---

bestie reminder: 0 = good, negative = bad, that's the whole mood 💀

and that's the page!! this one lives in ./drivers/s390/cio, dated October 2026, and it's literally titled ccw_driver_register(9) — iykyk 🦋✨💜