diff options
Diffstat (limited to 'debian/patches-rt/0009-serial-8250_exar-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0009-serial-8250_exar-Use-port-lock-wrappers.patch | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/debian/patches-rt/0009-serial-8250_exar-Use-port-lock-wrappers.patch b/debian/patches-rt/0009-serial-8250_exar-Use-port-lock-wrappers.patch deleted file mode 100644 index 80c37fba6..000000000 --- a/debian/patches-rt/0009-serial-8250_exar-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,52 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:26 +0206 -Subject: [PATCH 009/134] serial: 8250_exar: 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/20230914183831.587273-10-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_exar.c | 4 ++-- - 1 file changed, 2 insertions(+), 2 deletions(-) - ---- a/drivers/tty/serial/8250/8250_exar.c -+++ b/drivers/tty/serial/8250/8250_exar.c -@@ -201,9 +201,9 @@ static int xr17v35x_startup(struct uart_ - * - * Synchronize UART_IER access against the console. - */ -- spin_lock_irq(&port->lock); -+ uart_port_lock_irq(port); - serial_port_out(port, UART_IER, 0); -- spin_unlock_irq(&port->lock); -+ uart_port_unlock_irq(port); - - return serial8250_do_startup(port); - } |