diff options
Diffstat (limited to 'debian/patches-rt/0014-serial-altera_jtaguart-Use-port-lock-wrappers.patch')
-rw-r--r-- | debian/patches-rt/0014-serial-altera_jtaguart-Use-port-lock-wrappers.patch | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/debian/patches-rt/0014-serial-altera_jtaguart-Use-port-lock-wrappers.patch b/debian/patches-rt/0014-serial-altera_jtaguart-Use-port-lock-wrappers.patch deleted file mode 100644 index 46dbf785d..000000000 --- a/debian/patches-rt/0014-serial-altera_jtaguart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,133 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:31 +0206 -Subject: [PATCH 014/134] serial: altera_jtaguart: 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/20230914183831.587273-15-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/altera_jtaguart.c | 28 ++++++++++++++-------------- - 1 file changed, 14 insertions(+), 14 deletions(-) - ---- a/drivers/tty/serial/altera_jtaguart.c -+++ b/drivers/tty/serial/altera_jtaguart.c -@@ -147,14 +147,14 @@ static irqreturn_t altera_jtaguart_inter - isr = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) >> - ALTERA_JTAGUART_CONTROL_RI_OFF) & port->read_status_mask; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - if (isr & ALTERA_JTAGUART_CONTROL_RE_MSK) - altera_jtaguart_rx_chars(port); - if (isr & ALTERA_JTAGUART_CONTROL_WE_MSK) - altera_jtaguart_tx_chars(port); - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_RETVAL(isr); - } -@@ -180,14 +180,14 @@ static int altera_jtaguart_startup(struc - return ret; - } - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Enable RX interrupts now */ - port->read_status_mask = ALTERA_JTAGUART_CONTROL_RE_MSK; - writel(port->read_status_mask, - port->membase + ALTERA_JTAGUART_CONTROL_REG); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - return 0; - } -@@ -196,14 +196,14 @@ static void altera_jtaguart_shutdown(str - { - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Disable all interrupts now */ - port->read_status_mask = 0; - writel(port->read_status_mask, - port->membase + ALTERA_JTAGUART_CONTROL_REG); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - free_irq(port->irq, port); - } -@@ -264,33 +264,33 @@ static void altera_jtaguart_console_putc - unsigned long flags; - u32 status; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - while (!altera_jtaguart_tx_space(port, &status)) { -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0) { - return; /* no connection activity */ - } - - cpu_relax(); -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - } - writel(c, port->membase + ALTERA_JTAGUART_DATA_REG); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - #else - static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c) - { - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - while (!altera_jtaguart_tx_space(port, NULL)) { -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - cpu_relax(); -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - } - writel(c, port->membase + ALTERA_JTAGUART_DATA_REG); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - #endif - |