uart_port_lock_irq(9)

💅 uart_port_lock_irq(9) — the Kernel API Manual, but make it make sense 🎀

okay so bestie, welcome to the Kernel API Manual entry for uart_port_lock_irq(9). yes it's a mouthful. no you're not gonna fumble it. let's go 💖

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✨ NAME ✨

uart_port_lock_irq — lock the UART port AND disable interrupts. both. at the same time. she's an overachiever, we love her 💅

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🌸 SYNOPSIS 🌸

void uart_port_lock_irq (struct uart_port *up );

that's it. that's the whole vibe check. one function, one argument, zero returns. void is giving "i don't owe you a result" energy and honestly? iconic 👑

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🦋 ARGUMENTS 🦋

• up — pointer to the UART port structure ✨ literally just a pointer. that's the whole thing. it points at your UART port struct and the function does its lil lock-and-disable dance on it. no cap, that's all the docs say, and we're not gonna invent extra lore 🫶

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🧚 SEE ALSO 🧚

okay this is the part where the manpage just dumps the entire friend group at you 😭 but they're all relevant, i promise. no skimming!!

• the kernel file ./include/linux/serial_core.h, specifically the struct uart_ops(9) — that's where all this lives, go say hi 🌈
• uart_port_set_cons(9)
• uart_port_lock(9) — the plain-jane lock, no irq drama
• uart_port_lock_irqsave(9) — the one who also saves your irq state, very responsible of her 💜
• uart_port_trylock(9) — the non-committal one 🙈
• uart_port_trylock_irqsave(9)
• uart_port_unlock(9) — you WILL need this, bestie, don't forget to unlock, deadlocks are not cute 💀
• uart_port_unlock_irq(9)
• uart_port_unlock_irqrestore(9)
• enum uart_pm_state(9)
• uart_xmit_advance(9)
• enum UART_TX_FLAGS(9)
• uart_port_tx_limited(9)
• uart_port_tx_limited_flags(9)
• uart_port_tx(9)
• uart_port_tx_flags(9)

like i said. whole friend group. every single one. mwah 😘

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friendly reminder that this page is very short and that's on purpose — don't go reading behaviour into it that isn't written down, that's how you get bugs and bugs are not the move 💅

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and that's the page!! sign-off time 🎀 this little beauty lives over in ./include/linux, stamped October 2026, and she answers to the name uart_port_lock_irq(9) — go lock that port, disable those interrupts, and slay the day, bestie 💖✨🦋🌸🫶