diff options
Diffstat (limited to 'debian/patches-rt/0022-serial-bcm63xx-uart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0022-serial-bcm63xx-uart-Use-port-lock-wrappers.patch | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/debian/patches-rt/0022-serial-bcm63xx-uart-Use-port-lock-wrappers.patch b/debian/patches-rt/0022-serial-bcm63xx-uart-Use-port-lock-wrappers.patch deleted file mode 100644 index 90efec4080..0000000000 --- a/debian/patches-rt/0022-serial-bcm63xx-uart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,128 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:39 +0206 -Subject: [PATCH 022/134] serial: bcm63xx-uart: 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> -Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> -Signed-off-by: John Ogness <john.ogness@linutronix.de> -Link: https://lore.kernel.org/r/20230914183831.587273-23-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/bcm63xx_uart.c | 22 +++++++++++----------- - 1 file changed, 11 insertions(+), 11 deletions(-) - ---- a/drivers/tty/serial/bcm63xx_uart.c -+++ b/drivers/tty/serial/bcm63xx_uart.c -@@ -201,7 +201,7 @@ static void bcm_uart_break_ctl(struct ua - unsigned long flags; - unsigned int val; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - val = bcm_uart_readl(port, UART_CTL_REG); - if (ctl) -@@ -210,7 +210,7 @@ static void bcm_uart_break_ctl(struct ua - val &= ~UART_CTL_XMITBRK_MASK; - bcm_uart_writel(port, val, UART_CTL_REG); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - /* -@@ -332,7 +332,7 @@ static irqreturn_t bcm_uart_interrupt(in - unsigned int irqstat; - - port = dev_id; -- spin_lock(&port->lock); -+ uart_port_lock(port); - - irqstat = bcm_uart_readl(port, UART_IR_REG); - if (irqstat & UART_RX_INT_STAT) -@@ -353,7 +353,7 @@ static irqreturn_t bcm_uart_interrupt(in - estat & UART_EXTINP_DCD_MASK); - } - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - return IRQ_HANDLED; - } - -@@ -451,9 +451,9 @@ static void bcm_uart_shutdown(struct uar - { - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - bcm_uart_writel(port, 0, UART_IR_REG); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - bcm_uart_disable(port); - bcm_uart_flush(port); -@@ -470,7 +470,7 @@ static void bcm_uart_set_termios(struct - unsigned long flags; - int tries; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Drain the hot tub fully before we power it off for the winter. */ - for (tries = 3; !bcm_uart_tx_empty(port) && tries; tries--) -@@ -546,7 +546,7 @@ static void bcm_uart_set_termios(struct - - uart_update_timeout(port, new->c_cflag, baud); - bcm_uart_enable(port); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - /* -@@ -712,9 +712,9 @@ static void bcm_console_write(struct con - /* bcm_uart_interrupt() already took the lock */ - locked = 0; - } else if (oops_in_progress) { -- locked = spin_trylock(&port->lock); -+ locked = uart_port_trylock(port); - } else { -- spin_lock(&port->lock); -+ uart_port_lock(port); - locked = 1; - } - -@@ -725,7 +725,7 @@ static void bcm_console_write(struct con - wait_for_xmitr(port); - - if (locked) -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - local_irq_restore(flags); - } - |