From: Thomas Gleixner Date: Thu, 14 Sep 2023 20:43:56 +0206 Subject: [PATCH 039/134] serial: mpc52xx: Use port lock wrappers Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz 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/20230914183831.587273-40-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sebastian Andrzej Siewior --- drivers/tty/serial/mpc52xx_uart.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/tty/serial/mpc52xx_uart.c +++ b/drivers/tty/serial/mpc52xx_uart.c @@ -1096,14 +1096,14 @@ static void mpc52xx_uart_break_ctl(struct uart_port *port, int ctl) { unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); if (ctl == -1) psc_ops->command(port, MPC52xx_PSC_START_BRK); else psc_ops->command(port, MPC52xx_PSC_STOP_BRK); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } static int @@ -1214,7 +1214,7 @@ mpc52xx_uart_set_termios(struct uart_por } /* Get the lock */ - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); /* Do our best to flush TX & RX, so we don't lose anything */ /* But we don't wait indefinitely ! */ @@ -1250,7 +1250,7 @@ mpc52xx_uart_set_termios(struct uart_por psc_ops->command(port, MPC52xx_PSC_RX_ENABLE); /* We're all set, release the lock */ - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } static const char * @@ -1477,11 +1477,11 @@ mpc52xx_uart_int(int irq, void *dev_id) struct uart_port *port = dev_id; irqreturn_t ret; - spin_lock(&port->lock); + uart_port_lock(port); ret = psc_ops->handle_irq(port); - spin_unlock(&port->lock); + uart_port_unlock(port); return ret; }