diff options
Diffstat (limited to 'debian/patches-rt/0020-serial-arc_uart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0020-serial-arc_uart-Use-port-lock-wrappers.patch | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/debian/patches-rt/0020-serial-arc_uart-Use-port-lock-wrappers.patch b/debian/patches-rt/0020-serial-arc_uart-Use-port-lock-wrappers.patch deleted file mode 100644 index bc7be2c4d..000000000 --- a/debian/patches-rt/0020-serial-arc_uart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,97 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:37 +0206 -Subject: [PATCH 020/134] serial: arc_uart: 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/20230914183831.587273-21-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/arc_uart.c | 16 ++++++++-------- - 1 file changed, 8 insertions(+), 8 deletions(-) - ---- a/drivers/tty/serial/arc_uart.c -+++ b/drivers/tty/serial/arc_uart.c -@@ -279,9 +279,9 @@ static irqreturn_t arc_serial_isr(int ir - if (status & RXIENB) { - - /* already in ISR, no need of xx_irqsave */ -- spin_lock(&port->lock); -+ uart_port_lock(port); - arc_serial_rx_chars(port, status); -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - } - - if ((status & TXIENB) && (status & TXEMPTY)) { -@@ -291,12 +291,12 @@ static irqreturn_t arc_serial_isr(int ir - */ - UART_TX_IRQ_DISABLE(port); - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - if (!uart_tx_stopped(port)) - arc_serial_tx_chars(port); - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - } - - return IRQ_HANDLED; -@@ -366,7 +366,7 @@ arc_serial_set_termios(struct uart_port - uartl = hw_val & 0xFF; - uarth = (hw_val >> 8) & 0xFF; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - UART_ALL_IRQ_DISABLE(port); - -@@ -391,7 +391,7 @@ arc_serial_set_termios(struct uart_port - - uart_update_timeout(port, new->c_cflag, baud); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *arc_serial_type(struct uart_port *port) -@@ -521,9 +521,9 @@ static void arc_serial_console_write(str - struct uart_port *port = &arc_uart_ports[co->index].port; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - uart_console_write(port, s, count, arc_serial_console_putchar); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static struct console arc_console = { |