diff options
Diffstat (limited to 'debian/patches-rt/0042-serial-mvebu-uart-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0042-serial-mvebu-uart-Use-port-lock-wrappers.patch | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/debian/patches-rt/0042-serial-mvebu-uart-Use-port-lock-wrappers.patch b/debian/patches-rt/0042-serial-mvebu-uart-Use-port-lock-wrappers.patch deleted file mode 100644 index 28b2c3b46..000000000 --- a/debian/patches-rt/0042-serial-mvebu-uart-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,108 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:59 +0206 -Subject: [PATCH 042/134] serial: mvebu-uart: 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/20230914183831.587273-43-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/mvebu-uart.c | 18 +++++++++--------- - 1 file changed, 9 insertions(+), 9 deletions(-) - ---- a/drivers/tty/serial/mvebu-uart.c -+++ b/drivers/tty/serial/mvebu-uart.c -@@ -187,9 +187,9 @@ static unsigned int mvebu_uart_tx_empty( - unsigned long flags; - unsigned int st; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - st = readl(port->membase + UART_STAT); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - return (st & STAT_TX_EMP) ? TIOCSER_TEMT : 0; - } -@@ -249,14 +249,14 @@ static void mvebu_uart_break_ctl(struct - unsigned int ctl; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - ctl = readl(port->membase + UART_CTRL(port)); - if (brk == -1) - ctl |= CTRL_SND_BRK_SEQ; - else - ctl &= ~CTRL_SND_BRK_SEQ; - writel(ctl, port->membase + UART_CTRL(port)); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status) -@@ -540,7 +540,7 @@ static void mvebu_uart_set_termios(struc - unsigned long flags; - unsigned int baud, min_baud, max_baud; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - port->read_status_mask = STAT_RX_RDY(port) | STAT_OVR_ERR | - STAT_TX_RDY(port) | STAT_TX_FIFO_FUL; -@@ -589,7 +589,7 @@ static void mvebu_uart_set_termios(struc - uart_update_timeout(port, termios->c_cflag, baud); - } - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static const char *mvebu_uart_type(struct uart_port *port) -@@ -735,9 +735,9 @@ static void mvebu_uart_console_write(str - int locked = 1; - - 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); - - ier = readl(port->membase + UART_CTRL(port)) & CTRL_BRK_INT; - intr = readl(port->membase + UART_INTR(port)) & -@@ -758,7 +758,7 @@ static void mvebu_uart_console_write(str - } - - if (locked) -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static int mvebu_uart_console_setup(struct console *co, char *options) |