diff options
Diffstat (limited to 'debian/patches-rt/0071-serial-uartlite-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0071-serial-uartlite-Use-port-lock-wrappers.patch | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/debian/patches-rt/0071-serial-uartlite-Use-port-lock-wrappers.patch b/debian/patches-rt/0071-serial-uartlite-Use-port-lock-wrappers.patch deleted file mode 100644 index 13c64d7ee..000000000 --- a/debian/patches-rt/0071-serial-uartlite-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,105 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:28 +0206 -Subject: [PATCH 071/134] serial: uartlite: 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/20230914183831.587273-72-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/uartlite.c | 18 +++++++++--------- - 1 file changed, 9 insertions(+), 9 deletions(-) - ---- a/drivers/tty/serial/uartlite.c -+++ b/drivers/tty/serial/uartlite.c -@@ -216,11 +216,11 @@ static irqreturn_t ulite_isr(int irq, vo - unsigned long flags; - - do { -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - stat = uart_in32(ULITE_STATUS, port); - busy = ulite_receive(port, stat); - busy |= ulite_transmit(port, stat); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - n++; - } while (busy); - -@@ -238,9 +238,9 @@ static unsigned int ulite_tx_empty(struc - unsigned long flags; - unsigned int ret; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - ret = uart_in32(ULITE_STATUS, port); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0; - } -@@ -323,7 +323,7 @@ static void ulite_set_termios(struct uar - termios->c_cflag |= pdata->cflags & (PARENB | PARODD | CSIZE); - tty_termios_encode_baud_rate(termios, pdata->baud, pdata->baud); - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN - | ULITE_STATUS_TXFULL; -@@ -346,7 +346,7 @@ static void ulite_set_termios(struct uar - /* update timeout */ - uart_update_timeout(port, termios->c_cflag, pdata->baud); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *ulite_type(struct uart_port *port) -@@ -495,9 +495,9 @@ static void ulite_console_write(struct c - int locked = 1; - - if (oops_in_progress) { -- locked = spin_trylock_irqsave(&port->lock, flags); -+ locked = uart_port_trylock_irqsave(port, &flags); - } else -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* save and disable interrupt */ - ier = uart_in32(ULITE_STATUS, port) & ULITE_STATUS_IE; -@@ -512,7 +512,7 @@ static void ulite_console_write(struct c - uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port); - - if (locked) -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int ulite_console_setup(struct console *co, char *options) |