tty_port_put(9)

✨ tty_port_put(9) — the kernel API manual, but make it a group chat 🎀

okay so bestie, we're in the kernel API manual (section 9, the fun one) and today's main character is tty_port_put 💅

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🌸 NAME 🌸

tty_port_put — drop a reference to tty_port

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🦋 SYNOPSIS 🦋

void tty_port_put (struct tty_port *port );

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💖 ARGUMENTS 💖

• port — the port you're dropping a reference of (and yes bestie, it can be NULL 🫶)

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✨ DESCRIPTION ✨

So here's the tea 🍓: that final put is the one that actually destroys and frees up the port. Not me being dramatic, that's just literally what it does 😭

And how does it do the freeing? Two paths, iykyk:

• it uses the port->ops->destruct hook, or
• it just uses kfree if that hook isn't provided.

Either way, the last reference walking out the door is the one that cleans up. Iconic behavior honestly 👑

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🌈 SEE ALSO 🌈

Kernel file ./drivers/tty/tty_port.c and the whole tty_port squad, all linked up:

• tty_port_init(9)
• tty_port_link_wq(9)
• tty_port_link_device(9)
• tty_port_register_device(9)
• tty_port_register_device_attr(9)
• tty_port_register_device_attr_serdev(9)
• tty_port_unregister_device(9)
• tty_port_destroy(9)
• tty_port_tty_get(9)
• tty_port_tty_set(9)
• tty_port_shutdown(9)
• tty_port_hangup(9)
• tty_port_tty_hangup(9)
• tty_port_tty_vhangup(9)
• tty_port_tty_wakeup(9)
• tty_port_carrier_raised(9)
• tty_port_raise_dtr_rts(9)
• tty_port_lower_dtr_rts(9)
• tty_port_block_til_ready(9)
• tty_port_close_start(9)
• tty_port_close_end(9)
• tty_port_close(9)
• tty_port_install(9)
• tty_port_open(9)

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ngl, when that final put lands you better not be holding any other references, because this is the one that actually frees the port 💀 the port->ops->destruct hook is your moment to shine, otherwise it's plain old kfree doing the honors 🙈

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and that's a wrap bestie 🧚 this page lives in ./drivers/tty, dated October 2026, and it's part of the kernel API manual — slay, go free some ports responsibly 💜🎀