diff options
Diffstat (limited to 'debian/patches-rt/0061-serial-sifive-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0061-serial-sifive-Use-port-lock-wrappers.patch | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/debian/patches-rt/0061-serial-sifive-Use-port-lock-wrappers.patch b/debian/patches-rt/0061-serial-sifive-Use-port-lock-wrappers.patch deleted file mode 100644 index a2babdbea..000000000 --- a/debian/patches-rt/0061-serial-sifive-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,102 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:44:18 +0206 -Subject: [PATCH 061/134] serial: sifive: 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/20230914183831.587273-62-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/sifive.c | 16 ++++++++-------- - 1 file changed, 8 insertions(+), 8 deletions(-) - ---- a/drivers/tty/serial/sifive.c -+++ b/drivers/tty/serial/sifive.c -@@ -521,11 +521,11 @@ static irqreturn_t sifive_serial_irq(int - struct sifive_serial_port *ssp = dev_id; - u32 ip; - -- spin_lock(&ssp->port.lock); -+ uart_port_lock(&ssp->port); - - ip = __ssp_readl(ssp, SIFIVE_SERIAL_IP_OFFS); - if (!ip) { -- spin_unlock(&ssp->port.lock); -+ uart_port_unlock(&ssp->port); - return IRQ_NONE; - } - -@@ -534,7 +534,7 @@ static irqreturn_t sifive_serial_irq(int - if (ip & SIFIVE_SERIAL_IP_TXWM_MASK) - __ssp_transmit_chars(ssp); - -- spin_unlock(&ssp->port.lock); -+ uart_port_unlock(&ssp->port); - - return IRQ_HANDLED; - } -@@ -653,7 +653,7 @@ static void sifive_serial_set_termios(st - ssp->port.uartclk / 16); - __ssp_update_baud_rate(ssp, rate); - -- spin_lock_irqsave(&ssp->port.lock, flags); -+ uart_port_lock_irqsave(&ssp->port, &flags); - - /* Update the per-port timeout */ - uart_update_timeout(port, termios->c_cflag, rate); -@@ -670,7 +670,7 @@ static void sifive_serial_set_termios(st - if (v != old_v) - __ssp_writel(v, SIFIVE_SERIAL_RXCTRL_OFFS, ssp); - -- spin_unlock_irqrestore(&ssp->port.lock, flags); -+ uart_port_unlock_irqrestore(&ssp->port, flags); - } - - static void sifive_serial_release_port(struct uart_port *port) -@@ -795,9 +795,9 @@ static void sifive_serial_console_write( - if (ssp->port.sysrq) - locked = 0; - else if (oops_in_progress) -- locked = spin_trylock(&ssp->port.lock); -+ locked = uart_port_trylock(&ssp->port); - else -- spin_lock(&ssp->port.lock); -+ uart_port_lock(&ssp->port); - - ier = __ssp_readl(ssp, SIFIVE_SERIAL_IE_OFFS); - __ssp_writel(0, SIFIVE_SERIAL_IE_OFFS, ssp); -@@ -807,7 +807,7 @@ static void sifive_serial_console_write( - __ssp_writel(ier, SIFIVE_SERIAL_IE_OFFS, ssp); - - if (locked) -- spin_unlock(&ssp->port.lock); -+ uart_port_unlock(&ssp->port); - local_irq_restore(flags); - } - |