diff options
Diffstat (limited to 'debian/patches-rt/0035-serial-mcf-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0035-serial-mcf-Use-port-lock-wrappers.patch | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/debian/patches-rt/0035-serial-mcf-Use-port-lock-wrappers.patch b/debian/patches-rt/0035-serial-mcf-Use-port-lock-wrappers.patch deleted file mode 100644 index 966618a3e..000000000 --- a/debian/patches-rt/0035-serial-mcf-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,127 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:52 +0206 -Subject: [PATCH 035/134] serial: mcf: 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 <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(-) - ---- a/drivers/tty/serial/mcf.c -+++ b/drivers/tty/serial/mcf.c -@@ -135,12 +135,12 @@ 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); - } - - /****************************************************************************/ -@@ -150,7 +150,7 @@ 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); -@@ -164,7 +164,7 @@ 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; - } -@@ -176,7 +176,7 @@ 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; -@@ -186,7 +186,7 @@ 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); - } - - /****************************************************************************/ -@@ -252,7 +252,7 @@ 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; -@@ -273,7 +273,7 @@ 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); - } - - /****************************************************************************/ -@@ -350,7 +350,7 @@ 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; -@@ -359,7 +359,7 @@ static irqreturn_t mcf_interrupt(int irq - mcf_tx_chars(pp); - ret = IRQ_HANDLED; - } -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return ret; - } |