diff options
Diffstat (limited to 'debian/patches-rt/0038-serial-milbeaut_usio-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0038-serial-milbeaut_usio-Use-port-lock-wrappers.patch | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/debian/patches-rt/0038-serial-milbeaut_usio-Use-port-lock-wrappers.patch b/debian/patches-rt/0038-serial-milbeaut_usio-Use-port-lock-wrappers.patch deleted file mode 100644 index 47b1b7f3c..000000000 --- a/debian/patches-rt/0038-serial-milbeaut_usio-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,101 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:55 +0206 -Subject: [PATCH 038/134] serial: milbeaut_usio: 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/20230914183831.587273-39-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/milbeaut_usio.c | 16 ++++++++-------- - 1 file changed, 8 insertions(+), 8 deletions(-) - ---- a/drivers/tty/serial/milbeaut_usio.c -+++ b/drivers/tty/serial/milbeaut_usio.c -@@ -207,9 +207,9 @@ static irqreturn_t mlb_usio_rx_irq(int i - { - struct uart_port *port = dev_id; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - mlb_usio_rx_chars(port); -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_HANDLED; - } -@@ -218,10 +218,10 @@ static irqreturn_t mlb_usio_tx_irq(int i - { - struct uart_port *port = dev_id; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - if (readb(port->membase + MLB_USIO_REG_SSR) & MLB_USIO_SSR_TBI) - mlb_usio_tx_chars(port); -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_HANDLED; - } -@@ -267,7 +267,7 @@ static int mlb_usio_startup(struct uart_ - escr = readb(port->membase + MLB_USIO_REG_ESCR); - if (of_property_read_bool(port->dev->of_node, "auto-flow-control")) - escr |= MLB_USIO_ESCR_FLWEN; -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - writeb(0, port->membase + MLB_USIO_REG_SCR); - writeb(escr, port->membase + MLB_USIO_REG_ESCR); - writeb(MLB_USIO_SCR_UPCL, port->membase + MLB_USIO_REG_SCR); -@@ -282,7 +282,7 @@ static int mlb_usio_startup(struct uart_ - - writeb(MLB_USIO_SCR_TXE | MLB_USIO_SCR_RIE | MLB_USIO_SCR_TBIE | - MLB_USIO_SCR_RXE, port->membase + MLB_USIO_REG_SCR); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - return 0; - } -@@ -337,7 +337,7 @@ static void mlb_usio_set_termios(struct - else - quot = 0; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - uart_update_timeout(port, termios->c_cflag, baud); - port->read_status_mask = MLB_USIO_SSR_ORE | MLB_USIO_SSR_RDRF | - MLB_USIO_SSR_TDRE; -@@ -367,7 +367,7 @@ static void mlb_usio_set_termios(struct - writew(BIT(12), port->membase + MLB_USIO_REG_FBYTE); - writeb(MLB_USIO_SCR_RIE | MLB_USIO_SCR_RXE | MLB_USIO_SCR_TBIE | - MLB_USIO_SCR_TXE, port->membase + MLB_USIO_REG_SCR); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *mlb_usio_type(struct uart_port *port) |