diff options
Diffstat (limited to 'debian/patches-rt/0054-serial-sb1250-duart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0054-serial-sb1250-duart-Use-port-lock-wrappers.patch | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/debian/patches-rt/0054-serial-sb1250-duart-Use-port-lock-wrappers.patch b/debian/patches-rt/0054-serial-sb1250-duart-Use-port-lock-wrappers.patch deleted file mode 100644 index e5aeb528f..000000000 --- a/debian/patches-rt/0054-serial-sb1250-duart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,85 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:11 +0206 -Subject: [PATCH 054/134] serial: sb1250-duart: 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/20230914183831.587273-55-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/sb1250-duart.c | 12 ++++++------ - 1 file changed, 6 insertions(+), 6 deletions(-) - ---- a/drivers/tty/serial/sb1250-duart.c -+++ b/drivers/tty/serial/sb1250-duart.c -@@ -610,7 +610,7 @@ static void sbd_set_termios(struct uart_ - else - aux &= ~M_DUART_CTS_CHNG_ENA; - -- spin_lock(&uport->lock); -+ uart_port_lock(uport); - - if (sport->tx_stopped) - command |= M_DUART_TX_DIS; -@@ -632,7 +632,7 @@ static void sbd_set_termios(struct uart_ - - write_sbdchn(sport, R_DUART_CMD, command); - -- spin_unlock(&uport->lock); -+ uart_port_unlock(uport); - } - - -@@ -839,22 +839,22 @@ static void sbd_console_write(struct con - unsigned int mask; - - /* Disable transmit interrupts and enable the transmitter. */ -- spin_lock_irqsave(&uport->lock, flags); -+ uart_port_lock_irqsave(uport, &flags); - mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2)); - write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), - mask & ~M_DUART_IMR_TX); - write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN); -- spin_unlock_irqrestore(&uport->lock, flags); -+ uart_port_unlock_irqrestore(uport, flags); - - uart_console_write(&sport->port, s, count, sbd_console_putchar); - - /* Restore transmit interrupts and the transmitter enable. */ -- spin_lock_irqsave(&uport->lock, flags); -+ uart_port_lock_irqsave(uport, &flags); - sbd_line_drain(sport); - if (sport->tx_stopped) - write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS); - write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask); -- spin_unlock_irqrestore(&uport->lock, flags); -+ uart_port_unlock_irqrestore(uport, flags); - } - - static int __init sbd_console_setup(struct console *co, char *options) |