diff options
Diffstat (limited to 'debian/patches-rt/0025-serial-dz-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0025-serial-dz-Use-port-lock-wrappers.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/debian/patches-rt/0025-serial-dz-Use-port-lock-wrappers.patch b/debian/patches-rt/0025-serial-dz-Use-port-lock-wrappers.patch deleted file mode 100644 index 7b3f11604..000000000 --- a/debian/patches-rt/0025-serial-dz-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,161 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:42 +0206 -Subject: [PATCH 025/134] serial: dz: 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/20230914183831.587273-26-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/dz.c | 32 ++++++++++++++++---------------- - 1 file changed, 16 insertions(+), 16 deletions(-) - ---- a/drivers/tty/serial/dz.c -+++ b/drivers/tty/serial/dz.c -@@ -268,9 +268,9 @@ static inline void dz_transmit_chars(str - } - /* If nothing to do or stopped or hardware stopped. */ - if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) { -- spin_lock(&dport->port.lock); -+ uart_port_lock(&dport->port); - dz_stop_tx(&dport->port); -- spin_unlock(&dport->port.lock); -+ uart_port_unlock(&dport->port); - return; - } - -@@ -287,9 +287,9 @@ static inline void dz_transmit_chars(str - - /* Are we are done. */ - if (uart_circ_empty(xmit)) { -- spin_lock(&dport->port.lock); -+ uart_port_lock(&dport->port); - dz_stop_tx(&dport->port); -- spin_unlock(&dport->port.lock); -+ uart_port_unlock(&dport->port); - } - } - -@@ -415,14 +415,14 @@ static int dz_startup(struct uart_port * - return ret; - } - -- spin_lock_irqsave(&dport->port.lock, flags); -+ uart_port_lock_irqsave(&dport->port, &flags); - - /* Enable interrupts. */ - tmp = dz_in(dport, DZ_CSR); - tmp |= DZ_RIE | DZ_TIE; - dz_out(dport, DZ_CSR, tmp); - -- spin_unlock_irqrestore(&dport->port.lock, flags); -+ uart_port_unlock_irqrestore(&dport->port, flags); - - return 0; - } -@@ -443,9 +443,9 @@ static void dz_shutdown(struct uart_port - int irq_guard; - u16 tmp; - -- spin_lock_irqsave(&dport->port.lock, flags); -+ uart_port_lock_irqsave(&dport->port, &flags); - dz_stop_tx(&dport->port); -- spin_unlock_irqrestore(&dport->port.lock, flags); -+ uart_port_unlock_irqrestore(&dport->port, flags); - - irq_guard = atomic_add_return(-1, &mux->irq_guard); - if (!irq_guard) { -@@ -491,14 +491,14 @@ static void dz_break_ctl(struct uart_por - unsigned long flags; - unsigned short tmp, mask = 1 << dport->port.line; - -- spin_lock_irqsave(&uport->lock, flags); -+ uart_port_lock_irqsave(uport, &flags); - tmp = dz_in(dport, DZ_TCR); - if (break_state) - tmp |= mask; - else - tmp &= ~mask; - dz_out(dport, DZ_TCR, tmp); -- spin_unlock_irqrestore(&uport->lock, flags); -+ uart_port_unlock_irqrestore(uport, flags); - } - - static int dz_encode_baud_rate(unsigned int baud) -@@ -608,7 +608,7 @@ static void dz_set_termios(struct uart_p - if (termios->c_cflag & CREAD) - cflag |= DZ_RXENAB; - -- spin_lock_irqsave(&dport->port.lock, flags); -+ uart_port_lock_irqsave(&dport->port, &flags); - - uart_update_timeout(uport, termios->c_cflag, baud); - -@@ -631,7 +631,7 @@ static void dz_set_termios(struct uart_p - if (termios->c_iflag & IGNBRK) - dport->port.ignore_status_mask |= DZ_BREAK; - -- spin_unlock_irqrestore(&dport->port.lock, flags); -+ uart_port_unlock_irqrestore(&dport->port, flags); - } - - /* -@@ -645,12 +645,12 @@ static void dz_pm(struct uart_port *upor - struct dz_port *dport = to_dport(uport); - unsigned long flags; - -- spin_lock_irqsave(&dport->port.lock, flags); -+ uart_port_lock_irqsave(&dport->port, &flags); - if (state < 3) - dz_start_tx(&dport->port); - else - dz_stop_tx(&dport->port); -- spin_unlock_irqrestore(&dport->port.lock, flags); -+ uart_port_unlock_irqrestore(&dport->port, flags); - } - - -@@ -811,7 +811,7 @@ static void dz_console_putchar(struct ua - unsigned short csr, tcr, trdy, mask; - int loops = 10000; - -- spin_lock_irqsave(&dport->port.lock, flags); -+ uart_port_lock_irqsave(&dport->port, &flags); - csr = dz_in(dport, DZ_CSR); - dz_out(dport, DZ_CSR, csr & ~DZ_TIE); - tcr = dz_in(dport, DZ_TCR); -@@ -819,7 +819,7 @@ static void dz_console_putchar(struct ua - mask = tcr; - dz_out(dport, DZ_TCR, mask); - iob(); -- spin_unlock_irqrestore(&dport->port.lock, flags); -+ uart_port_unlock_irqrestore(&dport->port, flags); - - do { - trdy = dz_in(dport, DZ_CSR); |