__mdiobus_modify_changed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 __mdiobus_modify_changed — the kernel API manual, but make it make sense

okay so bestie, welcome to the __mdiobus_modify_changed(9) page from the Kernel API Manual — yes it's the unlocked version of the mdiobus_modify function, and yes we're gonna walk through it together like it's a group chat. 🎀

✨ NAME ✨

__mdiobus_modify_changed — the unlocked version of the mdiobus_modify function, no cap. 💅

🌸 SYNOPSIS 🌸

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

🦋 ARGUMENTS 🦋

  • bus — the mii_bus struct, the main character here 🫶
  • addr — the phy address. which one? this one ✨
  • regnum — register number to modify
  • mask — bit mask of bits to clear
  • set — bit mask of bits to set

⭐ RETURN ⭐

1 if the register was modified, 0 if no change was needed, negative on any error condition. it's giving simple binary slay 💀✨

💖 DESCRIPTION 💖

Read, modify, and if any change, write the register value back to the device. that's literally it, that's the whole vibe 😭

💀 NOTE 💀

MUST NOT be called from interrupt context. fr fr, do not do this. not the move. 🚫

🔥 SEE ALSO 🔥

Kernel file ./drivers/net/phy/mdio_bus.c — plus the whole squad, iykyk:

that's the whole page bestie, go forth and modify some registers (but not from interrupt context, bestie, I'm begging 🙈). this came straight out of ./drivers/net/phy, dated October 2026 — luv u, bye 💜🧚‍♀️🎀

📦 where this page comes from