diff options
Diffstat (limited to 'debian/patches-rt/0034-serial-ma35d1-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0034-serial-ma35d1-Use-port-lock-wrappers.patch | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/debian/patches-rt/0034-serial-ma35d1-Use-port-lock-wrappers.patch b/debian/patches-rt/0034-serial-ma35d1-Use-port-lock-wrappers.patch deleted file mode 100644 index 995bad9aad..0000000000 --- a/debian/patches-rt/0034-serial-ma35d1-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,117 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:51 +0206 -Subject: [PATCH 034/134] serial: ma35d1: 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/20230914183831.587273-35-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/ma35d1_serial.c | 22 +++++++++++----------- - 1 file changed, 11 insertions(+), 11 deletions(-) - ---- a/drivers/tty/serial/ma35d1_serial.c -+++ b/drivers/tty/serial/ma35d1_serial.c -@@ -269,16 +269,16 @@ static void receive_chars(struct uart_ma - if (uart_handle_sysrq_char(&up->port, ch)) - continue; - -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - uart_insert_char(&up->port, fsr, MA35_FSR_RX_OVER_IF, ch, flag); -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - - fsr = serial_in(up, MA35_FSR_REG); - } while (!(fsr & MA35_FSR_RX_EMPTY) && (max_count-- > 0)); - -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - tty_flip_buffer_push(&up->port.state->port); -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - } - - static irqreturn_t ma35d1serial_interrupt(int irq, void *dev_id) -@@ -364,14 +364,14 @@ static void ma35d1serial_break_ctl(struc - unsigned long flags; - u32 lcr; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - lcr = serial_in(up, MA35_LCR_REG); - if (break_state != 0) - lcr |= MA35_LCR_BREAK; - else - lcr &= ~MA35_LCR_BREAK; - serial_out(up, MA35_LCR_REG, lcr); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - static int ma35d1serial_startup(struct uart_port *port) -@@ -441,7 +441,7 @@ static void ma35d1serial_set_termios(str - * 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); - - up->port.read_status_mask = MA35_FSR_RX_OVER_IF; - if (termios->c_iflag & INPCK) -@@ -475,7 +475,7 @@ static void ma35d1serial_set_termios(str - - serial_out(up, MA35_LCR_REG, lcr); - -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - static const char *ma35d1serial_type(struct uart_port *port) -@@ -560,9 +560,9 @@ static void ma35d1serial_console_write(s - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) -- locked = spin_trylock_irqsave(&up->port.lock, flags); -+ locked = uart_port_trylock_irqsave(&up->port, &flags); - else -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - - /* - * First save the IER then disable the interrupts -@@ -576,7 +576,7 @@ static void ma35d1serial_console_write(s - serial_out(up, MA35_IER_REG, ier); - - if (locked) -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - static int __init ma35d1serial_console_setup(struct console *co, char *options) |