diff options
Diffstat (limited to 'debian/patches-rt/0016-serial-amba-pl010-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0016-serial-amba-pl010-Use-port-lock-wrappers.patch | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/debian/patches-rt/0016-serial-amba-pl010-Use-port-lock-wrappers.patch b/debian/patches-rt/0016-serial-amba-pl010-Use-port-lock-wrappers.patch deleted file mode 100644 index f3ba735bf..000000000 --- a/debian/patches-rt/0016-serial-amba-pl010-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,112 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:33 +0206 -Subject: [PATCH 016/134] serial: amba-pl010: 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/20230914183831.587273-17-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/amba-pl010.c | 20 ++++++++++---------- - 1 file changed, 10 insertions(+), 10 deletions(-) - ---- a/drivers/tty/serial/amba-pl010.c -+++ b/drivers/tty/serial/amba-pl010.c -@@ -207,7 +207,7 @@ static irqreturn_t pl010_int(int irq, vo - unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; - int handled = 0; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - status = readb(port->membase + UART010_IIR); - if (status) { -@@ -228,7 +228,7 @@ static irqreturn_t pl010_int(int irq, vo - handled = 1; - } - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_RETVAL(handled); - } -@@ -270,14 +270,14 @@ static void pl010_break_ctl(struct uart_ - unsigned long flags; - unsigned int lcr_h; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - lcr_h = readb(port->membase + UART010_LCRH); - if (break_state == -1) - lcr_h |= UART01x_LCRH_BRK; - else - lcr_h &= ~UART01x_LCRH_BRK; - writel(lcr_h, port->membase + UART010_LCRH); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int pl010_startup(struct uart_port *port) -@@ -385,7 +385,7 @@ pl010_set_termios(struct uart_port *port - if (port->fifosize > 1) - lcr_h |= UART01x_LCRH_FEN; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* - * Update the per-port timeout. -@@ -438,22 +438,22 @@ pl010_set_termios(struct uart_port *port - writel(lcr_h, port->membase + UART010_LCRH); - writel(old_cr, port->membase + UART010_CR); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static void pl010_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); - pl010_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); - pl010_disable_ms(port); -- spin_unlock_irq(&port->lock); -+ uart_port_unlock_irq(port); - } - } - } |