diff options
Diffstat (limited to 'debian/patches-rt/0032-serial-liteuart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0032-serial-liteuart-Use-port-lock-wrappers.patch | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/debian/patches-rt/0032-serial-liteuart-Use-port-lock-wrappers.patch b/debian/patches-rt/0032-serial-liteuart-Use-port-lock-wrappers.patch deleted file mode 100644 index ae679c098..000000000 --- a/debian/patches-rt/0032-serial-liteuart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,110 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:49 +0206 -Subject: [PATCH 032/134] serial: liteuart: 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: Gabriel Somlo <gsomlo@gmail.com> -Signed-off-by: John Ogness <john.ogness@linutronix.de> -Link: https://lore.kernel.org/r/20230914183831.587273-33-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/liteuart.c | 20 ++++++++++---------- - 1 file changed, 10 insertions(+), 10 deletions(-) - ---- a/drivers/tty/serial/liteuart.c -+++ b/drivers/tty/serial/liteuart.c -@@ -139,13 +139,13 @@ static irqreturn_t liteuart_interrupt(in - * if polling, the context would be "in_serving_softirq", so use - * irq[save|restore] spin_lock variants to cover all possibilities - */ -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - isr = litex_read8(port->membase + OFF_EV_PENDING) & uart->irq_reg; - if (isr & EV_RX) - liteuart_rx_chars(port); - if (isr & EV_TX) - liteuart_tx_chars(port); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - return IRQ_RETVAL(isr); - } -@@ -195,10 +195,10 @@ static int liteuart_startup(struct uart_ - } - } - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - /* only enabling rx irqs during startup */ - liteuart_update_irq_reg(port, true, EV_RX); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - if (!port->irq) { - timer_setup(&uart->timer, liteuart_timer, 0); -@@ -213,9 +213,9 @@ static void liteuart_shutdown(struct uar - struct liteuart_port *uart = to_liteuart_port(port); - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - liteuart_update_irq_reg(port, false, EV_RX | EV_TX); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - if (port->irq) - free_irq(port->irq, port); -@@ -229,13 +229,13 @@ static void liteuart_set_termios(struct - unsigned int baud; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* update baudrate */ - baud = uart_get_baud_rate(port, new, old, 0, 460800); - uart_update_timeout(port, new->c_cflag, baud); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *liteuart_type(struct uart_port *port) -@@ -382,9 +382,9 @@ static void liteuart_console_write(struc - uart = (struct liteuart_port *)xa_load(&liteuart_array, co->index); - port = &uart->port; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - uart_console_write(port, s, count, liteuart_putchar); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int liteuart_console_setup(struct console *co, char *options) |