rt2x00mmio_regbusy_read(9)

💅 rt2x00mmio_regbusy_read(9) — like, the Kernel API Manual era 🎀

okay bestie, so this is a page from the Kernel API Manual, and it's about one very specific little function called rt2x00mmio_regbusy_read. it's giving "niche but essential," and honestly? we're obsessed. let's get into it ✨

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🌸 NAME 🌸

rt2x00mmio_regbusy_read — reads from a register, but like... with a busy check. she doesn't just read and run, she waits and makes sure. 💅

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✨ SYNOPSIS ✨

int rt2x00mmio_regbusy_read (struct rt2x00_dev *rt2x00dev , const
       unsigned int offset , const struct rt2x00_field32 field , u32 *reg );

that's the whole vibe right there — int in, int out, four arguments, no cap. 🫶

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🦋 ARGUMENTS 🦋

• rt2x00dev — the device pointer, fr fr. it's a struct rt2x00_dev (see struct rt2x00_dev), so it's your main character device energy right here. 👑
• offset — the register offset. literally just where the register lives. lowkey important. 📍
• field — the field you're checking to see if the register is busy. this is the vibe check of the whole operation, honestly. 👀
• reg — a pointer to where the register contents should be stashed. yep, she writes it back out for you. 💖

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💜 DESCRIPTION 💜

okay so here's the whole story. this function reads the given register, and then it checks if that register is busy. that's it, that's the plot. but the way she does it? immaculate. 🌈

if the register is busy, she'll sleep for a couple of microseconds (self-care break 🧚), and then she reads the register again. iconic behaviour, honestly.

and if the register still isn't read after a certain timeout? she's done. she'll return FALSE. no drama, just boundaries. and that's on periodt. 💀

ngl, the "returns FALSE" thing is the part you actually need to remember — if it times out, you're getting FALSE, not a register read. plan accordingly bestie 😭

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🎀 SEE ALSO 🎀

• the kernel file ./drivers/net/wireless/ralink/rt2x00/rt2x00mmio.h — yes, that header, go read it 🌸
• struct queue_entry_priv_mmio(9)
• rt2x00mmio_rxdone(9)
• rt2x00mmio_flush_queue(9)

they're all literally sisters in the same rt2x00mmio friend group, iykyk 🫶

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and that's the whole page, bestie! 🍓 this one came from the Kernel API Manual, source path ./drivers/net/wireless/ralink/..., and it's dated October 2026 — rt2x00mmio_regbusy_read(9) and out. slay 💅✨