get_ccwdev_by_busid(9)

okay so bestie, welcome to get_ccwdev_by_busid(9) from the Kernel API Manual 💅 this one is short but iconic: it’s giving “find my device by bus id” energy ✨

🌸 NAME 🌸

get_ccwdev_by_busid — obtain device from a bus id 🫶

✨ SYNOPSIS ✨

struct ccw_device * get_ccwdev_by_busid (struct ccw_driver *cdrv , const
       char *bus_id );

🎀 ARGUMENTS 🎀

• cdrv — the driver the device is owned by, no cap 💖
• bus_id — the bus id of the device to be searched, bestie 🔍

🦋 DESCRIPTION 🦋

This function searches all devices owned by cdrv for a device with a bus id matching bus_id. literally a little matchmaking mission for devices 💅✨

⭐ RETURN ⭐

If a match is found, the found device’s reference count is increased and it is returned. If there’s no match, NULL is returned. that’s the whole vibe 😭

important detail from the original: the reference count of the found device is increased when there is a match, bestie 👑

💜 SEE ALSO 💜

Kernel file: ./drivers/s390/cio/device.c — also peep these, iykyk:

• 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)
• ccw_driver_register(9)
• ccw_driver_unregister(9)
• ccw_device_sched_todo(9)
• ccw_device_siosl(9)

mwah 💖 source/version corner: ./drivers/s390/cio, October 2026, and this whole page is get_ccwdev_by_busid(9). periodt 💅🎀