__mdiobus_c4...dify_changed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 __mdiobus_c45_modify_changed — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual entry for __mdiobus_c45_modify_changed(9) 👑 this is the unlocked version of the mdiobus_modify function, and yes she has main character energy but she also has rules, so let's get into it 🫶

✨ NAME ✨

__mdiobus_c45_modify_changed — the Unlocked version of the mdiobus_modify function 🔓💖

🌸 SYNOPSIS 🌸

int __mdiobus_c45_modify_changed (struct mii_bus *bus , int addr , int
devad , u32 regnum , u16 mask , u16 set );

🎀 ARGUMENTS 🎀

  • bus — the mii_bus struct, she's the whole vibe holder fr
  • addr — the phy address
  • devad — device address to read
  • regnum — register number to modify, like the exact little spot we're messing with
  • mask — bit mask of bits to clear 🧹
  • set — bit mask of bits to set 🪄

🦋 RETURN 🦋

  • Returns 1 if the register was modified 🔥
  • Returns 0 if no change was needed (respect, lowkey)
  • Returns a negative value on any error condition 😭

🌈 DESCRIPTION 🌈

So the way this works is: read, modify, and if there's any change, write the register value back to the device. That's literally the whole loop, she ate 💅

Any error returns a negative number 🫶

💀 NOTE 💀

MUST NOT be called from interrupt context. not me stressing this, but please, bestie, do not do it 🙈

⭐ SEE ALSO ⭐

Kernel file ./drivers/net/phy/mdio_bus.c 🍓 and all her friends:

okay that's the whole page, ily, go forth and modify responsibly 🧚💜

source: ./drivers/net/phy · October 2026 · __mdiobus_c4...dify_changed(9) — mwah, see u in the next manpage bestie 💋🎀

📦 where this page comes from