usb_autosuspend_device(9)

💖 usb_autosuspend_device(9) 💖

okay bestie, welcome to the Kernel API Manual — today's main character is usb_autosuspend_device, and it's giving delayed autosuspend for a USB device and its interfaces. no cap. ✨

🌸 NAME 🌸

usb_autosuspend_device — delayed autosuspend of a USB device and its interfaces

✨ SYNOPSIS ✨

void usb_autosuspend_device (struct usb_device *udev );

🎀 ARGUMENTS 🎀

• udev — the usb_device to autosuspend

💅 DESCRIPTION 💅

so this routine is what you call when a core subsystem is finished using udev and wants to allow it to autosuspend. examples? when udev's device file in usbfs is closed, or after a configuration change. iconic behavior, honestly. 🫶

here's the vibe check on what happens: udev's usage counter is decremented. if it drops to 0 and all the interfaces are inactive, then a delayed autosuspend will be attempted. but bestie, the attempt may fail (see autosuspend_check). not every nap works out 😭

the caller must hold udev's device lock. periodt. 🔥

and this routine can run only in process context — that's the rule, no cap.

🦋 SEE ALSO 🦋

the kernel file is ./drivers/usb/core/driver.c, and the whole friend group is:

• usb_driver_claim_interface(9)
• usb_driver_release_interface(9)
• usb_match_id(9)
• usb_register_device_driver(9)
• usb_deregister_device_driver(9)
• usb_register_driver(9)
• usb_deregister(9)
• usb_suspend_both(9)
• usb_resume_both(9)
• usb_enable_autosuspend(9)
• usb_disable_autosuspend(9)
• usb_autoresume_device(9)
• usb_autopm_put_interface(9)
• usb_autopm_put_interface_async(9)
• usb_autopm_put_interface_no_suspend(9)
• usb_autopm_get_interface(9)
• usb_autopm_get_interface_async(9)
• usb_autopm_get_interface_no_resume(9)

with all the love from ./drivers/usb/core, dated October 2026 — mwah, bestie 💋✨