diff options
Diffstat (limited to 'debian/patches-rt/0063-serial-st-asc-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0063-serial-st-asc-Use-port-lock-wrappers.patch | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/debian/patches-rt/0063-serial-st-asc-Use-port-lock-wrappers.patch b/debian/patches-rt/0063-serial-st-asc-Use-port-lock-wrappers.patch deleted file mode 100644 index 99f4358e61..0000000000 --- a/debian/patches-rt/0063-serial-st-asc-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,110 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:20 +0206 -Subject: [PATCH 063/134] serial: st-asc: 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/20230914183831.587273-64-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/st-asc.c | 18 +++++++++--------- - 1 file changed, 9 insertions(+), 9 deletions(-) - ---- a/drivers/tty/serial/st-asc.c -+++ b/drivers/tty/serial/st-asc.c -@@ -319,7 +319,7 @@ static irqreturn_t asc_interrupt(int irq - struct uart_port *port = ptr; - u32 status; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - status = asc_in(port, ASC_STA); - -@@ -334,7 +334,7 @@ static irqreturn_t asc_interrupt(int irq - asc_transmit_chars(port); - } - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_HANDLED; - } -@@ -452,10 +452,10 @@ static void asc_pm(struct uart_port *por - * we can come to turning it off. Note this is not called with - * the port spinlock held. - */ -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - ctl = asc_in(port, ASC_CTL) & ~ASC_CTL_RUN; - asc_out(port, ASC_CTL, ctl); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - clk_disable_unprepare(ascport->clk); - break; - } -@@ -480,7 +480,7 @@ static void asc_set_termios(struct uart_ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - cflag = termios->c_cflag; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* read control register */ - ctrl_val = asc_in(port, ASC_CTL); -@@ -594,7 +594,7 @@ static void asc_set_termios(struct uart_ - /* write final value and enable port */ - asc_out(port, ASC_CTL, (ctrl_val | ASC_CTL_RUN)); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *asc_type(struct uart_port *port) -@@ -849,9 +849,9 @@ static void asc_console_write(struct con - if (port->sysrq) - locked = 0; /* asc_interrupt has already claimed the lock */ - else 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); - - /* - * Disable interrupts so we don't get the IRQ line bouncing -@@ -869,7 +869,7 @@ static void asc_console_write(struct con - asc_out(port, ASC_INTEN, intenable); - - if (locked) -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int asc_console_setup(struct console *co, char *options) |