diff options
Diffstat (limited to 'debian/patches-rt/0013-serial-8250_pci1xxxx-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0013-serial-8250_pci1xxxx-Use-port-lock-wrappers.patch | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/debian/patches-rt/0013-serial-8250_pci1xxxx-Use-port-lock-wrappers.patch b/debian/patches-rt/0013-serial-8250_pci1xxxx-Use-port-lock-wrappers.patch deleted file mode 100644 index 291638769..000000000 --- a/debian/patches-rt/0013-serial-8250_pci1xxxx-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,66 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:30 +0206 -Subject: [PATCH 013/134] serial: 8250_pci1xxxx: 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/20230914183831.587273-14-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_pci1xxxx.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - ---- a/drivers/tty/serial/8250/8250_pci1xxxx.c -+++ b/drivers/tty/serial/8250/8250_pci1xxxx.c -@@ -225,10 +225,10 @@ static bool pci1xxxx_port_suspend(int li - if (port->suspended == 0 && port->dev) { - wakeup_mask = readb(up->port.membase + UART_WAKE_MASK_REG); - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - port->mctrl &= ~TIOCM_OUT2; - port->ops->set_mctrl(port, port->mctrl); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - ret = (wakeup_mask & UART_WAKE_SRCS) != UART_WAKE_SRCS; - } -@@ -251,10 +251,10 @@ static void pci1xxxx_port_resume(int lin - writeb(UART_WAKE_SRCS, port->membase + UART_WAKE_REG); - - if (port->suspended == 0) { -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - port->mctrl |= TIOCM_OUT2; - port->ops->set_mctrl(port, port->mctrl); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - mutex_unlock(&tport->mutex); - } |