diff options
Diffstat (limited to 'debian/patches-rt/0070-serial-timbuart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0070-serial-timbuart-Use-port-lock-wrappers.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/debian/patches-rt/0070-serial-timbuart-Use-port-lock-wrappers.patch b/debian/patches-rt/0070-serial-timbuart-Use-port-lock-wrappers.patch deleted file mode 100644 index 2d5a3d95e..000000000 --- a/debian/patches-rt/0070-serial-timbuart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,71 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:27 +0206 -Subject: [PATCH 070/134] serial: timbuart: 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/20230914183831.587273-71-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/timbuart.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - ---- a/drivers/tty/serial/timbuart.c -+++ b/drivers/tty/serial/timbuart.c -@@ -174,7 +174,7 @@ static void timbuart_tasklet(struct task - struct timbuart_port *uart = from_tasklet(uart, t, tasklet); - u32 isr, ier = 0; - -- spin_lock(&uart->port.lock); -+ uart_port_lock(&uart->port); - - isr = ioread32(uart->port.membase + TIMBUART_ISR); - dev_dbg(uart->port.dev, "%s ISR: %x\n", __func__, isr); -@@ -189,7 +189,7 @@ static void timbuart_tasklet(struct task - - iowrite32(ier, uart->port.membase + TIMBUART_IER); - -- spin_unlock(&uart->port.lock); -+ uart_port_unlock(&uart->port); - dev_dbg(uart->port.dev, "%s leaving\n", __func__); - } - -@@ -295,10 +295,10 @@ static void timbuart_set_termios(struct - tty_termios_copy_hw(termios, old); - tty_termios_encode_baud_rate(termios, baud, baud); - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - iowrite8((u8)bindex, port->membase + TIMBUART_BAUDRATE); - uart_update_timeout(port, termios->c_cflag, baud); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *timbuart_type(struct uart_port *port) |