STRUCT F_EEM_OPTS(9)

💅 struct f_eem_opts(9) 💅

okay so welcome to the Kernel API Manual, bestie — we're doing EEM function options today and honestly? it's giving "small struct, big responsibilities." let's get into it 🫶

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✨ NAME ✨

struct f_eem_opts — the EEM function options. that's the whole name, that's the whole vibe. no cap. 💖

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🎀 SYNOPSIS 🎀

struct f_eem_opts {
    struct usb_function_instance    func_inst;
    struct net_device               *net;
    bool bound;
    int bind_count;
    struct mutex                    lock;
    int refcnt;
 };

six members, one struct, zero skips. we're listing every single one, periodt. 🌸

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👑 Members 👑

okay so here's the cast of characters — main character energy only:

• func_inst — the USB function instance. literally the whole point of the thing, it's a struct usb_function_instance. iconic. ✨
• net — the struct net_device that's associated with the EEM function. it's a pointer, so y'know, handle it like one 💅
• bound — a bool. it's True if the net_device is shared and already pre-registered during the legacy composite driver's bind phase (think multi.c, iykyk). if it's false, then no stress — the EEM function will register the net_device itself during its own bind phase. two paths, one truth 🌈
• bind_count — an int that tracks how many configurations the EEM function is bound to. its whole job is preventing double-registration of the net device. not me being the group chat's responsible friend 😭🔥
• lock — a struct mutex protecting the data from concurrent access by configfs read/write and create symlink/remove symlink operations. it's the bouncer at the door fr fr 🫶
• refcnt — the reference counter for the function instance. it's an int. don't lose track of it, bestie 💀

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/usb/gadget/function/u_eem.h — go read the header, it slays 🍓

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ok that's the whole page, no notes. every field accounted for, every doc line intact, we ate and left absolutely no crumbs 🧚‍♀️

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sign-off szn: this little beauty lives in ./drivers/usb/gadget/function and the manual's dated October 2026 — see you in the future, bestie, mwah 💜🎀