From 9b3ce8f4924d20af62e1958030c88c035e5664a6 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 14 Sep 2023 20:43:22 +0206 Subject: [PATCH 032/195] serial: 8250_bcm7271: 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 Signed-off-by: John Ogness Link: https://lore.kernel.org/r/20230914183831.587273-6-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sebastian Andrzej Siewior --- drivers/tty/serial/8250/8250_bcm7271.c | 28 +++++++++++++------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c index aa5aff046756..ff0662c68725 100644 --- a/drivers/tty/serial/8250/8250_bcm7271.c +++ b/drivers/tty/serial/8250/8250_bcm7271.c @@ -567,7 +567,7 @@ static irqreturn_t brcmuart_isr(int irq, void *dev_id) if (interrupts == 0) return IRQ_NONE; - spin_lock_irqsave(&up->lock, flags); + uart_port_lock_irqsave(up, &flags); /* Clear all interrupts */ udma_writel(priv, REGS_DMA_ISR, UDMA_INTR_CLEAR, interrupts); @@ -581,7 +581,7 @@ static irqreturn_t brcmuart_isr(int irq, void *dev_id) if ((rval | tval) == 0) dev_warn(dev, "Spurious interrupt: 0x%x\n", interrupts); - spin_unlock_irqrestore(&up->lock, flags); + uart_port_unlock_irqrestore(up, flags); return IRQ_HANDLED; } @@ -608,10 +608,10 @@ static int brcmuart_startup(struct uart_port *port) * * Synchronize UART_IER access against the console. */ - spin_lock_irq(&port->lock); + uart_port_lock_irq(port); up->ier &= ~UART_IER_RDI; serial_port_out(port, UART_IER, up->ier); - spin_unlock_irq(&port->lock); + uart_port_unlock_irq(port); priv->tx_running = false; priv->dma.rx_dma = NULL; @@ -629,7 +629,7 @@ static void brcmuart_shutdown(struct uart_port *port) struct brcmuart_priv *priv = up->port.private_data; unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); priv->shutdown = true; if (priv->dma_enabled) { stop_rx_dma(up); @@ -645,7 +645,7 @@ static void brcmuart_shutdown(struct uart_port *port) */ up->dma = NULL; - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); serial8250_do_shutdown(port); } @@ -788,7 +788,7 @@ static int brcmuart_handle_irq(struct uart_port *p) * interrupt but there is no data ready. */ if (((iir & UART_IIR_ID) == UART_IIR_RX_TIMEOUT) && !(priv->shutdown)) { - spin_lock_irqsave(&p->lock, flags); + uart_port_lock_irqsave(p, &flags); status = serial_port_in(p, UART_LSR); if ((status & UART_LSR_DR) == 0) { @@ -813,7 +813,7 @@ static int brcmuart_handle_irq(struct uart_port *p) handled = 1; } - spin_unlock_irqrestore(&p->lock, flags); + uart_port_unlock_irqrestore(p, flags); if (handled) return 1; } @@ -831,7 +831,7 @@ static enum hrtimer_restart brcmuart_hrtimer_func(struct hrtimer *t) if (priv->shutdown) return HRTIMER_NORESTART; - spin_lock_irqsave(&p->lock, flags); + uart_port_lock_irqsave(p, &flags); status = serial_port_in(p, UART_LSR); /* @@ -855,7 +855,7 @@ static enum hrtimer_restart brcmuart_hrtimer_func(struct hrtimer *t) status |= UART_MCR_RTS; serial_port_out(p, UART_MCR, status); } - spin_unlock_irqrestore(&p->lock, flags); + uart_port_unlock_irqrestore(p, flags); return HRTIMER_NORESTART; } @@ -1154,10 +1154,10 @@ static int __maybe_unused brcmuart_suspend(struct device *dev) * This will prevent resume from enabling RTS before the * baud rate has been restored. */ - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); priv->saved_mctrl = port->mctrl; port->mctrl &= ~TIOCM_RTS; - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); serial8250_suspend_port(priv->line); clk_disable_unprepare(priv->baud_mux_clk); @@ -1196,10 +1196,10 @@ static int __maybe_unused brcmuart_resume(struct device *dev) if (priv->saved_mctrl & TIOCM_RTS) { /* Restore RTS */ - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); port->mctrl |= TIOCM_RTS; port->ops->set_mctrl(port, port->mctrl); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } return 0; -- 2.43.0