usb_put_intf(9)

🎀 usb_put_intf(9) — from the Kernel API Manual (yes bestie, that's the whole vibe) 🎀

okay so picture this: you've been holding onto a struct usb_interface like it's the last iced coffee in the fridge, and now it's time to let go. This is the ✨letting go✨ page. Welcome to usb_put_intf.

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💖 NAME 💖

usb_put_intf — release a use of the usb interface structure. that's it, that's the whole gig 💅

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🌸 SYNOPSIS 🌸

void usb_put_intf (struct usb_interface *intf );

like, literally that. one function, one argument, zero drama 🦋

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🧚 ARGUMENTS 🧚

• intf — the interface that's been decremented. it's the one whose refcount just went down, so it's the one you're handing back 🫶

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🔥 DESCRIPTION 🔥

kay so here's the tea, and it's important tea: you must call this when a user of an interface is finished with it. not "whenever", not "if you feel like it" — when you're done, you call it. periodt 💀

and then the magical part: when the last user of the interface calls this function, the memory of the interface is freed. like the lights go off, the party's over, the interface is gone-gone. so bestie, please please please don't keep touching that intf after the final put — that's giving use-after-free and we are NOT doing that 🙈

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👑 SEE ALSO 👑

the kernel file lives at ./drivers/usb/core/usb.c (iconic location, no cap), and here's the whole friend group 🫶:

• 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_intf_get_dma_device(9)
• usb_lock_device_for_reset(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)

go read them, they're all slay in their own way ⭐

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lowkey reminder from your girl: get the refcounting right and you're the main character. get it wrong and the kernel will vibe check you back. 💀✨

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and that's a wrap on usb_put_intf(9) 🎀 this page came out of ./drivers/usb/core, dated October 2026, and it's filed under the title usb_put_intf(9) — mwah, love u, go free that interface 💜