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serial: core: Provide low-level functions to lock port

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BugLink: https://bugs.launchpad.net/bugs/2060704

It will be necessary at times for the uart nbcon console
drivers to acquire the port lock directly (without the
additional nbcon functionality of the port lock wrappers).
These are special cases such as the implementation of the
device_lock()/device_unlock() callbacks or for internal
port lock wrapper synchronization.

Provide low-level variants __uart_port_lock_irqsave() and
__uart_port_unlock_irqrestore() for this purpose.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kevin Becker <kevin.becker@canonical.com>
This commit is contained in:
John Ogness
2023-12-11 09:19:18 +00:00
committed by Kevin Becker
parent be656d0beb
commit bd313d71a9
1 changed files with 18 additions and 0 deletions
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include/linux/serial_core.h
+18
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@@ -589,6 +589,24 @@ struct uart_port {
void *private_data; /* generic platform data pointer */
};
/*
* Only for console->device_lock()/_unlock() callbacks and internal
* port lock wrapper synchronization.
*/
static inline void __uart_port_lock_irqsave(struct uart_port *up, unsigned long *flags)
{
spin_lock_irqsave(&up->lock, *flags);
}
/*
* Only for console->device_lock()/_unlock() callbacks and internal
* port lock wrapper synchronization.
*/
static inline void __uart_port_unlock_irqrestore(struct uart_port *up, unsigned long flags)
{
spin_unlock_irqrestore(&up->lock, flags);
}
/**
* uart_port_lock - Lock the UART port
* @up: Pointer to UART port structure