diff options
Diffstat (limited to 'debian/patches-rt/0021-serial-atmel-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0021-serial-atmel-Use-port-lock-wrappers.patch | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/debian/patches-rt/0021-serial-atmel-Use-port-lock-wrappers.patch b/debian/patches-rt/0021-serial-atmel-Use-port-lock-wrappers.patch deleted file mode 100644 index ab70954a1..000000000 --- a/debian/patches-rt/0021-serial-atmel-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,119 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:38 +0206 -Subject: [PATCH 021/134] serial: atmel: 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/20230914183831.587273-22-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/atmel_serial.c | 24 ++++++++++++------------ - 1 file changed, 12 insertions(+), 12 deletions(-) - ---- a/drivers/tty/serial/atmel_serial.c -+++ b/drivers/tty/serial/atmel_serial.c -@@ -861,7 +861,7 @@ static void atmel_complete_tx_dma(void * - struct dma_chan *chan = atmel_port->chan_tx; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - if (chan) - dmaengine_terminate_all(chan); -@@ -893,7 +893,7 @@ static void atmel_complete_tx_dma(void * - atmel_port->tx_done_mask); - } - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static void atmel_release_tx_dma(struct uart_port *port) -@@ -1711,9 +1711,9 @@ static void atmel_tasklet_rx_func(struct - struct uart_port *port = &atmel_port->uart; - - /* The interrupt handler does not take the lock */ -- spin_lock(&port->lock); -+ uart_port_lock(port); - atmel_port->schedule_rx(port); -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - } - - static void atmel_tasklet_tx_func(struct tasklet_struct *t) -@@ -1723,9 +1723,9 @@ static void atmel_tasklet_tx_func(struct - struct uart_port *port = &atmel_port->uart; - - /* The interrupt handler does not take the lock */ -- spin_lock(&port->lock); -+ uart_port_lock(port); - atmel_port->schedule_tx(port); -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - } - - static void atmel_init_property(struct atmel_uart_port *atmel_port, -@@ -2175,7 +2175,7 @@ static void atmel_set_termios(struct uar - } else - mode |= ATMEL_US_PAR_NONE; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - port->read_status_mask = ATMEL_US_OVRE; - if (termios->c_iflag & INPCK) -@@ -2377,22 +2377,22 @@ static void atmel_set_termios(struct uar - else - atmel_disable_ms(port); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static void atmel_set_ldisc(struct uart_port *port, struct ktermios *termios) - { - if (termios->c_line == N_PPS) { - port->flags |= UPF_HARDPPS_CD; -- spin_lock_irq(&port->lock); -+ uart_port_lock_irq(port); - atmel_enable_ms(port); -- spin_unlock_irq(&port->lock); -+ uart_port_unlock_irq(port); - } else { - port->flags &= ~UPF_HARDPPS_CD; - if (!UART_ENABLE_MS(port, termios->c_cflag)) { -- spin_lock_irq(&port->lock); -+ uart_port_lock_irq(port); - atmel_disable_ms(port); -- spin_unlock_irq(&port->lock); -+ uart_port_unlock_irq(port); - } - } - } |