From 0c805baef9c3b0f7a2924a6fc5a89c96fab2f372 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner <tglx@linutronix.de> Date: Thu, 14 Sep 2023 20:43:52 +0206 Subject: [PATCH 061/204] serial: mcf: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-36-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- drivers/tty/serial/mcf.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) Index: linux-6.6.58-rt45/drivers/tty/serial/mcf.c =================================================================== @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:138 @ static void mcf_break_ctl(struct uart_po { unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); if (break_state == -1) writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR); else writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } /****************************************************************************/ @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:153 @ static int mcf_startup(struct uart_port struct mcf_uart *pp = container_of(port, struct mcf_uart, port); unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); /* Reset UART, get it into known state... */ writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR); @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:167 @ static int mcf_startup(struct uart_port pp->imr = MCFUART_UIR_RXREADY; writeb(pp->imr, port->membase + MCFUART_UIMR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); return 0; } @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:179 @ static void mcf_shutdown(struct uart_por struct mcf_uart *pp = container_of(port, struct mcf_uart, port); unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); /* Disable all interrupts now */ pp->imr = 0; @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:189 @ static void mcf_shutdown(struct uart_por writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR); writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } /****************************************************************************/ @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:255 @ static void mcf_set_termios(struct uart_ mr2 |= MCFUART_MR2_TXCTS; } - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); if (port->rs485.flags & SER_RS485_ENABLED) { dev_dbg(port->dev, "Setting UART to RS485\n"); mr2 |= MCFUART_MR2_TXRTS; @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:276 @ static void mcf_set_termios(struct uart_ port->membase + MCFUART_UCSR); writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } /****************************************************************************/ @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:353 @ static irqreturn_t mcf_interrupt(int irq isr = readb(port->membase + MCFUART_UISR) & pp->imr; - spin_lock(&port->lock); + uart_port_lock(port); if (isr & MCFUART_UIR_RXREADY) { mcf_rx_chars(pp); ret = IRQ_HANDLED; @ linux-6.6.58-rt45/drivers/tty/serial/mcf.c:362 @ static irqreturn_t mcf_interrupt(int irq mcf_tx_chars(pp); ret = IRQ_HANDLED; } - spin_unlock(&port->lock); + uart_port_unlock(port); return ret; }