From 3565071f226432336a54d0193d729fa4508a3394 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:28:00 +0200 Subject: Adding debian version 6.6.15-2. Signed-off-by: Daniel Baumann --- ...9-serial-qcom-geni-Use-port-lock-wrappers.patch | 71 ++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 debian/patches-rt/0049-serial-qcom-geni-Use-port-lock-wrappers.patch (limited to 'debian/patches-rt/0049-serial-qcom-geni-Use-port-lock-wrappers.patch') diff --git a/debian/patches-rt/0049-serial-qcom-geni-Use-port-lock-wrappers.patch b/debian/patches-rt/0049-serial-qcom-geni-Use-port-lock-wrappers.patch new file mode 100644 index 0000000000..4f1bc6a1cb --- /dev/null +++ b/debian/patches-rt/0049-serial-qcom-geni-Use-port-lock-wrappers.patch @@ -0,0 +1,71 @@ +From: Thomas Gleixner +Date: Thu, 14 Sep 2023 20:44:06 +0206 +Subject: [PATCH 049/134] serial: qcom-geni: 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 +Reviewed-by: Bjorn Andersson +Signed-off-by: John Ogness +Link: https://lore.kernel.org/r/20230914183831.587273-50-john.ogness@linutronix.de +Signed-off-by: Greg Kroah-Hartman +Signed-off-by: Sebastian Andrzej Siewior +--- + drivers/tty/serial/qcom_geni_serial.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +--- a/drivers/tty/serial/qcom_geni_serial.c ++++ b/drivers/tty/serial/qcom_geni_serial.c +@@ -482,9 +482,9 @@ static void qcom_geni_serial_console_wri + + uport = &port->uport; + if (oops_in_progress) +- locked = spin_trylock_irqsave(&uport->lock, flags); ++ locked = uart_port_trylock_irqsave(uport, &flags); + else +- spin_lock_irqsave(&uport->lock, flags); ++ uart_port_lock_irqsave(uport, &flags); + + geni_status = readl(uport->membase + SE_GENI_STATUS); + +@@ -520,7 +520,7 @@ static void qcom_geni_serial_console_wri + qcom_geni_serial_setup_tx(uport, port->tx_remaining); + + if (locked) +- spin_unlock_irqrestore(&uport->lock, flags); ++ uart_port_unlock_irqrestore(uport, flags); + } + + static void handle_rx_console(struct uart_port *uport, u32 bytes, bool drop) +@@ -970,7 +970,7 @@ static irqreturn_t qcom_geni_serial_isr( + if (uport->suspended) + return IRQ_NONE; + +- spin_lock(&uport->lock); ++ uart_port_lock(uport); + + m_irq_status = readl(uport->membase + SE_GENI_M_IRQ_STATUS); + s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS); -- cgit v1.2.3