diff options
Diffstat (limited to 'debian/patches-rt/0003-serial-21285-Use-port-lock-wrappers.patch')
-rw-r--r-- | debian/patches-rt/0003-serial-21285-Use-port-lock-wrappers.patch | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/debian/patches-rt/0003-serial-21285-Use-port-lock-wrappers.patch b/debian/patches-rt/0003-serial-21285-Use-port-lock-wrappers.patch deleted file mode 100644 index e025de601c..0000000000 --- a/debian/patches-rt/0003-serial-21285-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,75 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:20 +0206 -Subject: [PATCH 003/134] serial: 21285: 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/20230914183831.587273-4-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/21285.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - ---- a/drivers/tty/serial/21285.c -+++ b/drivers/tty/serial/21285.c -@@ -185,14 +185,14 @@ static void serial21285_break_ctl(struct - unsigned long flags; - unsigned int h_lcr; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - h_lcr = *CSR_H_UBRLCR; - if (break_state) - h_lcr |= H_UBRLCR_BREAK; - else - h_lcr &= ~H_UBRLCR_BREAK; - *CSR_H_UBRLCR = h_lcr; -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int serial21285_startup(struct uart_port *port) -@@ -272,7 +272,7 @@ serial21285_set_termios(struct uart_port - if (port->fifosize) - h_lcr |= H_UBRLCR_FIFO; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* - * Update the per-port timeout. -@@ -309,7 +309,7 @@ serial21285_set_termios(struct uart_port - *CSR_H_UBRLCR = h_lcr; - *CSR_UARTCON = 1; - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *serial21285_type(struct uart_port *port) |