ccw_device_verify_start(9)

💅 ccw_device_verify_start(9) — like, the whole glow-up

okay bestie, welcome to the Kernel API Manual ✨ this one lives in the s390 cio corner of the kernel and it's genuinely so fun, i promise. it's giving "who's actually alive in this friend group" energy — except the friend group is channel paths and the friend who's checking is you 🫶

---

🌸 NAME 🌸

ccw_device_verify_start — perform path verification. that's it, that's the whole vibe check 💅

---

✨ SYNOPSIS ✨

void ccw_device_verify_start (struct ccw_device *cdev );

literally no return value, no drama, just vibes and a void. iconique.

---

🎀 ARGUMENTS 🎀

• cdev — the ccw device. that's your main character right there 👑

---

🦋 DESCRIPTION 🦋

okay so here's the plan, and honestly it ate 🔥

you perform an I/O on each available channel path to cdev — yes, every single one, no skipping, we're checking all of them 😤 — to determine which paths are operational. it's a whole group chat poll of "are you up bestie?" and some of them will leave you on read 😭

the resulting path mask gets stored in sch->vpm. note it down, that's important, that's the receipts 📝

then — and this is the cute part — if the device options specify pathgrouping, you establish a pathgroup for the operational paths. so the ones that showed up get their own little clique 🌈

when you're finished, call ccw_device_verify_done with a return code specifying the result. you cannot just ghost it, king — the callback needs to know how it went 💀

---

👑 SEE ALSO 👑

• the kernel file: ./drivers/s390/cio/device_pgid.c
• ccw_device_disband_start(9) — the "okay everyone go home" counterpart 🫶
• ccw_device_stlck_start(9) — another one from the same friend group ⭐

---

that's the whole page, bestie, no cap 💖

mwah, tysm for reading 💅 this masterpiece comes to you from the Kernel API Manual, source ./drivers/s390/cio, dated October 2026 — catch you in the next ccw_device_*_start(9) bestie, ily 🌸🦋✨