diff options
Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0010-serial-8250_fsl-Use-port-lock-wrappers.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/debian/patches-rt/0010-serial-8250_fsl-Use-port-lock-wrappers.patch b/debian/patches-rt/0010-serial-8250_fsl-Use-port-lock-wrappers.patch new file mode 100644 index 000000000..abe7c81a9 --- /dev/null +++ b/debian/patches-rt/0010-serial-8250_fsl-Use-port-lock-wrappers.patch @@ -0,0 +1,63 @@ +From: Thomas Gleixner <tglx@linutronix.de> +Date: Thu, 14 Sep 2023 20:43:27 +0206 +Subject: [PATCH 010/134] serial: 8250_fsl: 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/20230914183831.587273-11-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/8250/8250_fsl.c | 6 +++--- + 1 file changed, 3 insertions(+), 3 deletions(-) + +--- a/drivers/tty/serial/8250/8250_fsl.c ++++ b/drivers/tty/serial/8250/8250_fsl.c +@@ -30,11 +30,11 @@ int fsl8250_handle_irq(struct uart_port + unsigned int iir; + struct uart_8250_port *up = up_to_u8250p(port); + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + iir = port->serial_in(port, UART_IIR); + if (iir & UART_IIR_NO_INT) { +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + return 0; + } + +@@ -54,7 +54,7 @@ int fsl8250_handle_irq(struct uart_port + if (unlikely(up->lsr_saved_flags & UART_LSR_BI)) { + up->lsr_saved_flags &= ~UART_LSR_BI; + port->serial_in(port, UART_RX); +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + return 1; + } + |