diff options
Diffstat (limited to 'debian/patches-rt/0019-serial-ar933x-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0019-serial-ar933x-Use-port-lock-wrappers.patch | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/debian/patches-rt/0019-serial-ar933x-Use-port-lock-wrappers.patch b/debian/patches-rt/0019-serial-ar933x-Use-port-lock-wrappers.patch deleted file mode 100644 index 61a5d3b1a6..0000000000 --- a/debian/patches-rt/0019-serial-ar933x-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,144 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:36 +0206 -Subject: [PATCH 019/134] serial: ar933x: 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/20230914183831.587273-20-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/ar933x_uart.c | 26 +++++++++++++------------- - 1 file changed, 13 insertions(+), 13 deletions(-) - ---- a/drivers/tty/serial/ar933x_uart.c -+++ b/drivers/tty/serial/ar933x_uart.c -@@ -133,9 +133,9 @@ static unsigned int ar933x_uart_tx_empty - unsigned long flags; - unsigned int rdata; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT; - } -@@ -220,14 +220,14 @@ static void ar933x_uart_break_ctl(struct - container_of(port, struct ar933x_uart_port, port); - unsigned long flags; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - if (break_state == -1) - ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, - AR933X_UART_CS_TX_BREAK); - else - ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, - AR933X_UART_CS_TX_BREAK); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - /* -@@ -318,7 +318,7 @@ static void ar933x_uart_set_termios(stru - * Ok, we're now changing the port state. Do it with - * interrupts disabled. - */ -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - - /* disable the UART */ - ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, -@@ -352,7 +352,7 @@ static void ar933x_uart_set_termios(stru - AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S, - AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S); - -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - if (tty_termios_baud_rate(new)) - tty_termios_encode_baud_rate(new, baud, baud); -@@ -450,7 +450,7 @@ static irqreturn_t ar933x_uart_interrupt - if ((status & AR933X_UART_CS_HOST_INT) == 0) - return IRQ_NONE; - -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - - status = ar933x_uart_read(up, AR933X_UART_INT_REG); - status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG); -@@ -468,7 +468,7 @@ static irqreturn_t ar933x_uart_interrupt - ar933x_uart_tx_chars(up); - } - -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - - return IRQ_HANDLED; - } -@@ -485,7 +485,7 @@ static int ar933x_uart_startup(struct ua - if (ret) - return ret; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - - /* Enable HOST interrupts */ - ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, -@@ -498,7 +498,7 @@ static int ar933x_uart_startup(struct ua - /* Enable RX interrupts */ - ar933x_uart_start_rx_interrupt(up); - -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - return 0; - } -@@ -632,9 +632,9 @@ static void ar933x_uart_console_write(st - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) -- locked = spin_trylock(&up->port.lock); -+ locked = uart_port_trylock(&up->port); - else -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - - /* - * First save the IER then disable the interrupts -@@ -654,7 +654,7 @@ static void ar933x_uart_console_write(st - ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS); - - if (locked) -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - - local_irq_restore(flags); - } |