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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:59 +0000 |
commit | 27d3313807296c3943a96ceef8c2b7279cb56962 (patch) | |
tree | 7d08e78c36ab6437b403fc7cd8c23e41f135c7a3 /debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch | |
parent | Merging upstream version 6.7.7. (diff) | |
download | linux-debian/6.7.7-1.tar.xz linux-debian/6.7.7-1.zip |
Adding debian version 6.7.7-1.debian/6.7.7-1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch')
-rw-r--r-- | debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch b/debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch deleted file mode 100644 index 4dcf54a895..0000000000 --- a/debian/patches-rt/0018-serial-apb-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,76 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:35 +0206 -Subject: [PATCH 018/134] serial: apb: 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/20230914183831.587273-19-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/apbuart.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - ---- a/drivers/tty/serial/apbuart.c -+++ b/drivers/tty/serial/apbuart.c -@@ -133,7 +133,7 @@ static irqreturn_t apbuart_int(int irq, - struct uart_port *port = dev_id; - unsigned int status; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - status = UART_GET_STATUS(port); - if (status & UART_STATUS_DR) -@@ -141,7 +141,7 @@ static irqreturn_t apbuart_int(int irq, - if (status & UART_STATUS_THE) - apbuart_tx_chars(port); - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_HANDLED; - } -@@ -228,7 +228,7 @@ static void apbuart_set_termios(struct u - if (termios->c_cflag & CRTSCTS) - cr |= UART_CTRL_FL; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Update the per-port timeout. */ - uart_update_timeout(port, termios->c_cflag, baud); -@@ -251,7 +251,7 @@ static void apbuart_set_termios(struct u - UART_PUT_SCAL(port, quot); - UART_PUT_CTRL(port, cr); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *apbuart_type(struct uart_port *port) |