usb_lock_device_for_reset(9)

💅 usb_lock_device_for_reset — the Kernel API Manual, bestie edition 🎀

okay so real talk, this one is a kernel API manual page for usb_lock_device_for_reset(9), and it's basically the "can i please have the lock, but like, cautiously" of the USB world ✨

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🌸 NAME 🌸

usb_lock_device_for_reset — cautiously acquire the lock for a usb device structure. yes the "cautiously" is doing a lot of work there, she's an icon 💅

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🦋 SYNOPSIS 🦋

int usb_lock_device_for_reset (struct usb_device *udev , const struct
       usb_interface *iface );

that's the whole signature, no cap, keep it exactly like that 🫶

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🎀 ARGUMENTS 🎀

• udev — the device that's being locked, like the main character of this whole operation 👑
• iface — the interface bound to the driver making the request, and it's optional. lowkey nice of her to be optional honestly 🙈

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✨ DESCRIPTION ✨

so what she does is attempt to acquire the device lock, but she's gonna fail — respectfully — if the device is NOTATTACHED or SUSPENDED 💀

also she fails if iface is specified and the interface is neither BINDING nor BOUND. vibe check failed, no lock for you 🍓

and here's the cute part: rather than sleeping to wait for the lock, the routine polls repeatedly. why? to prevent deadlock with disconnect, bestie 😭 in some drivers (such as usb-storage) the disconnect or suspend method will block waiting for a device reset to complete. so sleeping = deadlock, polling = slay 🔥

fr fr, the polling isn't laziness, it's survival. do not "optimize" it into a sleep, iykyk.

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💖 RETURN 💖

A negative error code for failure, otherwise 0. that's it, that's the whole return section, short and iconic ⭐

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🌈 SEE ALSO 🌈

Kernel file ./drivers/usb/core/usb.c plus the whole friend group, and yes we're naming every single one because they all deserve their moment 🫶

• usb_find_common_endpoints(9)
• usb_find_common_endpoints_reverse(9)
• usb_find_endpoint(9)
• usb_check_bulk_endpoints(9)
• usb_check_int_endpoints(9)
• usb_find_alt_setting(9)
• usb_ifnum_to_if(9)
• usb_altnum_to_altsetting(9)
• usb_find_interface(9)
• usb_for_each_dev(9)
• usb_release_dev(9)
• usb_alloc_dev(9)
• usb_get_dev(9)
• usb_put_dev(9)
• usb_get_intf(9)
• usb_put_intf(9)
• usb_intf_get_dma_device(9)
• usb_get_current_frame_number(9)
• usb_alloc_coherent(9)
• usb_free_coherent(9)
• usb_alloc_noncoherent(9)
• usb_free_noncoherent(9)
• usb_endpoint_max_periodic_payload(9)
• usb_endpoint_is_hs_isoc_double(9)

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and that's the page, bestie 💜 this one lives in ./drivers/usb/core, dated October 2026, and it ships as usb_lock_device_for_reset(9) in the Kernel API Manual — go forth and poll responsibly 😌💅