diff options
Diffstat (limited to 'debian/patches-rt/0072-serial-ucc_uart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0072-serial-ucc_uart-Use-port-lock-wrappers.patch | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/debian/patches-rt/0072-serial-ucc_uart-Use-port-lock-wrappers.patch b/debian/patches-rt/0072-serial-ucc_uart-Use-port-lock-wrappers.patch deleted file mode 100644 index 30681434a..000000000 --- a/debian/patches-rt/0072-serial-ucc_uart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,59 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:29 +0206 -Subject: [PATCH 072/134] serial: ucc_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> -Acked-by: Timur Tabi <timur@kernel.org> -Signed-off-by: John Ogness <john.ogness@linutronix.de> -Link: https://lore.kernel.org/r/20230914183831.587273-73-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/ucc_uart.c | 4 ++-- - 1 file changed, 2 insertions(+), 2 deletions(-) - ---- a/drivers/tty/serial/ucc_uart.c -+++ b/drivers/tty/serial/ucc_uart.c -@@ -931,7 +931,7 @@ static void qe_uart_set_termios(struct u - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); - - /* Do we really need a spinlock here? */ -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Update the per-port timeout. */ - uart_update_timeout(port, termios->c_cflag, baud); -@@ -949,7 +949,7 @@ static void qe_uart_set_termios(struct u - qe_setbrg(qe_port->us_info.tx_clock, baud, 16); - } - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - /* |