diff options
Diffstat (limited to 'debian/patches-rt/0048-serial-pxa-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0048-serial-pxa-Use-port-lock-wrappers.patch | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/debian/patches-rt/0048-serial-pxa-Use-port-lock-wrappers.patch b/debian/patches-rt/0048-serial-pxa-Use-port-lock-wrappers.patch deleted file mode 100644 index b0df211b6f..0000000000 --- a/debian/patches-rt/0048-serial-pxa-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,150 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:05 +0206 -Subject: [PATCH 048/134] serial: pxa: 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/20230914183831.587273-49-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/pxa.c | 30 +++++++++++++++--------------- - 1 file changed, 15 insertions(+), 15 deletions(-) - ---- a/drivers/tty/serial/pxa.c -+++ b/drivers/tty/serial/pxa.c -@@ -225,14 +225,14 @@ static inline irqreturn_t serial_pxa_irq - iir = serial_in(up, UART_IIR); - if (iir & UART_IIR_NO_INT) - return IRQ_NONE; -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - lsr = serial_in(up, UART_LSR); - if (lsr & UART_LSR_DR) - receive_chars(up, &lsr); - check_modem_status(up); - if (lsr & UART_LSR_THRE) - transmit_chars(up); -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - return IRQ_HANDLED; - } - -@@ -242,9 +242,9 @@ static unsigned int serial_pxa_tx_empty( - unsigned long flags; - unsigned int ret; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - return ret; - } -@@ -295,13 +295,13 @@ static void serial_pxa_break_ctl(struct - struct uart_pxa_port *up = (struct uart_pxa_port *)port; - unsigned long flags; - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - if (break_state == -1) - up->lcr |= UART_LCR_SBC; - else - up->lcr &= ~UART_LCR_SBC; - serial_out(up, UART_LCR, up->lcr); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - static int serial_pxa_startup(struct uart_port *port) -@@ -346,10 +346,10 @@ static int serial_pxa_startup(struct uar - */ - serial_out(up, UART_LCR, UART_LCR_WLEN8); - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - up->port.mctrl |= TIOCM_OUT2; - serial_pxa_set_mctrl(&up->port, up->port.mctrl); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - /* - * Finally, enable interrupts. Note: Modem status interrupts -@@ -383,10 +383,10 @@ static void serial_pxa_shutdown(struct u - up->ier = 0; - serial_out(up, UART_IER, 0); - -- spin_lock_irqsave(&up->port.lock, flags); -+ uart_port_lock_irqsave(&up->port, &flags); - up->port.mctrl &= ~TIOCM_OUT2; - serial_pxa_set_mctrl(&up->port, up->port.mctrl); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - - /* - * Disable break condition and FIFOs -@@ -434,7 +434,7 @@ serial_pxa_set_termios(struct uart_port - * 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); - - /* - * Ensure the port will be enabled. -@@ -504,7 +504,7 @@ serial_pxa_set_termios(struct uart_port - up->lcr = cval; /* Save LCR */ - serial_pxa_set_mctrl(&up->port, up->port.mctrl); - serial_out(up, UART_FCR, fcr); -- spin_unlock_irqrestore(&up->port.lock, flags); -+ uart_port_unlock_irqrestore(&up->port, flags); - } - - static void -@@ -608,9 +608,9 @@ serial_pxa_console_write(struct console - 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 -@@ -628,7 +628,7 @@ serial_pxa_console_write(struct console - serial_out(up, UART_IER, ier); - - if (locked) -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - local_irq_restore(flags); - clk_disable(up->clk); - |