parport_yield(9)

💅 parport_yield(9) — Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and it's about parport_yield, which is genuinely one of those little functions that eats and leaves no crumbs. parallel port girlies, this one's for you 🫶

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✨ NAME ✨

parport_yield — relinquish a parallel port temporarily 💫

like, just for a sec. she'll be right back.

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🌸 SYNOPSIS 🌸

int parport_yield (struct pardevice *dev );

that's it. that's the whole vibe check. one argument, one int coming back at you 🔥

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🦋 ARGUMENTS 🦋

• dev — a device on the parallel port. that's your device, bestie, the one you're holding the port for. main character energy, honestly 👑

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💖 DESCRIPTION 💖

so here's the tea ☕: this function relinquishes the port if it would be helpful to other drivers to do so. not always — only if it'd be helpful. she's considerate like that 💅

afterwards, she tries to reclaim the port using parport_claim, and the return value is the same as for parport_claim. same code, same drama, no surprises.

⚠️ but listen — if it fails, the port is left unclaimed, and it is the driver's responsibility to reclaim the port. not the kernel's. not parport_yield's. yours. no cap, do not forget this one 😭

now, the bigger picture, because this is important 🧚:

the parport_yield and parport_yield_blocking functions are for marking points in the driver at which other drivers may claim the port and use their devices. they're like lil "you can go now" signposts in your code, iconic behaviour honestly 🎀

Yielding the port is similar to releasing it and reclaiming it, but is more efficient — because no action is taken if there are no other devices needing the port. why do paperwork if nobody's asking, yk? 💀

in fact, nothing is done even if there are other devices waiting but the current device is still within its "timeslice". she checked, she saw you're still within your window, she moved on. lowkey respectful 🙈

the default timeslice is half a second, but it can be adjusted via the /proc interface. half a second. that's the default. adjust away ✨

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/parport.h — the source of truth, go read it 📖
• parport_register_driver(9)
• module_parport_driver(9)
• parport_yield_blocking(9) — the blocking sibling, she's in her own lane 🦋

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and that's the whole page, bestie 💜 this one came from ./include/linux, dated October 2026, under the title parport_yield(9) — so go forth, yield that port, and slay ✨👑🌸

— xoxo, your local kernel girlie 💅🎀