linux-kernel - [PATCH 03/16] serial: introduce uart_port

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Message-ID: <20250814072456.182853-4-jirislaby@kernel.org>
Date: Thu, 14 Aug 2025 09:24:43 +0200
From: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 03/16] serial: introduce uart_port_lock() guard()s

Having this, guards like these work:
  guard(uart_port_lock_irq)(&up->port);
or
  scoped_guard(uart_port_lock_irqsave, port) {
    ...
  }

See e.g. "serial: 8250: use guard()s" later in this series.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 include/linux/serial_core.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 84b4648ead7e..666430b47899 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -788,6 +788,19 @@ static inline void uart_port_unlock_irqrestore(struct uart_port *up, unsigned lo
 	spin_unlock_irqrestore(&up->lock, flags);
 }
 
+DEFINE_GUARD(uart_port_lock, struct uart_port *, uart_port_lock(_T), uart_port_unlock(_T));
+DEFINE_GUARD_COND(uart_port_lock, _try, uart_port_trylock(_T));
+
+DEFINE_GUARD(uart_port_lock_irq, struct uart_port *, uart_port_lock_irq(_T),
+	     uart_port_unlock_irq(_T));
+
+DEFINE_LOCK_GUARD_1(uart_port_lock_irqsave, struct uart_port,
+                    uart_port_lock_irqsave(_T->lock, &_T->flags),
+                    uart_port_unlock_irqrestore(_T->lock, _T->flags),
+                    unsigned long flags);
+DEFINE_LOCK_GUARD_1_COND(uart_port_lock_irqsave, _try,
+			 uart_port_trylock_irqsave(_T->lock, &_T->flags));
+
 static inline int serial_port_in(struct uart_port *up, int offset)
 {
 	return up->serial_in(up, offset);
-- 
2.50.1