gs_start_io(9)

🌸 NAME 🌸

gs_start_io — start USB I/O streams 💖

okay so this is the gs_start_io(9) page from the Kernel API Manual, and it's literally about getting USB I/O streams going. Bestie, think of it as the “go go go” signal for a serial gadget port ✨.

✨ SYNOPSIS ✨

int gs_start_io (struct gs_port *port );

🎀 ARGUMENTS 🎀

• port — the port to use 🫶

💅 CONTEXT 💅

You must be holding port_lock, and port_tty and port_usb are non-null. That's the setup, no exceptions 💀

🦋 DESCRIPTION 🦋

The vibe check here is simple: we only start I/O when something is connected to both sides of this port. Both sides, bestie — not one, not kinda, both 🌈.

If nothing is listening on the host side, then we may be pointlessly filling up our TX buffers and FIFO 😭. Literally no one is receiving it, so that's just wasted effort.

👑 SEE ALSO 👑

• Kernel file ./drivers/usb/gadget/function/u_serial.c 📄
• gserial_connect(9) 🔌
• gserial_disconnect(9) 🪫

xoxo, your gs_start_io(9) bestie 💅 — source/version: ./drivers/usb/gadget/function, dated October 2026 🎀