bus_get_dev_root(9)

💅 bus_get_dev_root(9) 💅

okay so bestie, this page is from the Kernel API Manual, and it's literally about grabbing the “device root” pointer for a bus. yes ma’am, that’s the whole assignment. ✨

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🌸 NAME 🌸

bus_get_dev_root — return a pointer to the “device root” of a bus. slay. 💖

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🎀 SYNOPSIS 🎀

struct device * bus_get_dev_root (const struct bus_type *bus );

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🦋 ARGUMENTS 🦋

• bus — the bus you want the device root of, bestie. that’s it. that’s the argument. 💅

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✨ DESCRIPTION ✨

okay so if a bus has a “device root” structure, this returns it — WITH THE REFERENCE COUNT INCREMENTED. yes, all caps, because this part is important, no cap. 🔥

⚠️ note, when you’re finished with the device, a call to put_device is required. do not forget this, bestie. the reference is not gonna clean itself up. 💀

if the device root is not present — or if bus is not a valid pointer — NULL will be returned. that’s the vibe check failing, and you get NULL. 🙈

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🔎 SEE ALSO 🔎

the Kernel file ./drivers/base/bus.c is the spot, and these are the related pages, all listed exactly because we keep every single one, periodt:

• bus_to_subsys(9)
• bus_for_each_dev(9)
• bus_find_device(9)
• bus_for_each_drv(9)
• bus_add_device(9)
• bus_probe_device(9)
• bus_remove_device(9)
• bus_add_driver(9)
• bus_remove_driver(9)
• bus_rescan_devices(9)
• device_reprobe(9)
• bus_register(9)
• bus_unregister(9)
• subsys_dev_iter_init(9)
• subsys_dev_iter_next(9)
• subsys_dev_iter_exit(9)
• subsys_system_register(9)
• subsys_virtual_register(9)
• driver_find(9)

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okay that’s the whole page, bestie 🫶 — this one’s from ./drivers/base, dated October 2026. now go forth and remember put_device(), or else. 💅🎀💖