diff options
Diffstat (limited to 'debian/patches-rt/0033-serial-lpc32xx_hs-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0033-serial-lpc32xx_hs-Use-port-lock-wrappers.patch | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/debian/patches-rt/0033-serial-lpc32xx_hs-Use-port-lock-wrappers.patch b/debian/patches-rt/0033-serial-lpc32xx_hs-Use-port-lock-wrappers.patch deleted file mode 100644 index 06518e846..000000000 --- a/debian/patches-rt/0033-serial-lpc32xx_hs-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,148 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:50 +0206 -Subject: [PATCH 033/134] serial: lpc32xx_hs: 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/20230914183831.587273-34-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/lpc32xx_hs.c | 26 +++++++++++++------------- - 1 file changed, 13 insertions(+), 13 deletions(-) - ---- a/drivers/tty/serial/lpc32xx_hs.c -+++ b/drivers/tty/serial/lpc32xx_hs.c -@@ -140,15 +140,15 @@ static void lpc32xx_hsuart_console_write - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) -- locked = spin_trylock(&up->port.lock); -+ locked = uart_port_trylock(&up->port); - else -- spin_lock(&up->port.lock); -+ uart_port_lock(&up->port); - - uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar); - wait_for_xmit_empty(&up->port); - - if (locked) -- spin_unlock(&up->port.lock); -+ uart_port_unlock(&up->port); - local_irq_restore(flags); - } - -@@ -298,7 +298,7 @@ static irqreturn_t serial_lpc32xx_interr - struct tty_port *tport = &port->state->port; - u32 status; - -- spin_lock(&port->lock); -+ uart_port_lock(port); - - /* Read UART status and clear latched interrupts */ - status = readl(LPC32XX_HSUART_IIR(port->membase)); -@@ -333,7 +333,7 @@ static irqreturn_t serial_lpc32xx_interr - __serial_lpc32xx_tx(port); - } - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - return IRQ_HANDLED; - } -@@ -404,14 +404,14 @@ static void serial_lpc32xx_break_ctl(str - unsigned long flags; - u32 tmp; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); - if (break_state != 0) - tmp |= LPC32XX_HSU_BREAK; - else - tmp &= ~LPC32XX_HSU_BREAK; - writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - /* port->lock is not held. */ -@@ -421,7 +421,7 @@ static int serial_lpc32xx_startup(struct - unsigned long flags; - u32 tmp; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - __serial_uart_flush(port); - -@@ -441,7 +441,7 @@ static int serial_lpc32xx_startup(struct - - lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */ - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - retval = request_irq(port->irq, serial_lpc32xx_interrupt, - 0, MODNAME, port); -@@ -458,7 +458,7 @@ static void serial_lpc32xx_shutdown(stru - u32 tmp; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B | - LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B; -@@ -466,7 +466,7 @@ static void serial_lpc32xx_shutdown(stru - - lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */ - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - free_irq(port->irq, port); - } -@@ -491,7 +491,7 @@ static void serial_lpc32xx_set_termios(s - - quot = __serial_get_clock_div(port->uartclk, baud); - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - - /* Ignore characters? */ - tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); -@@ -505,7 +505,7 @@ static void serial_lpc32xx_set_termios(s - - uart_update_timeout(port, termios->c_cflag, baud); - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - /* Don't rewrite B0 */ - if (tty_termios_baud_rate(termios)) |