diff options
Diffstat (limited to 'debian/patches-rt/0005-serial-8250_bcm7271-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0005-serial-8250_bcm7271-Use-port-lock-wrappers.patch | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/debian/patches-rt/0005-serial-8250_bcm7271-Use-port-lock-wrappers.patch b/debian/patches-rt/0005-serial-8250_bcm7271-Use-port-lock-wrappers.patch deleted file mode 100644 index 55ae035b8..000000000 --- a/debian/patches-rt/0005-serial-8250_bcm7271-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,151 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:22 +0206 -Subject: [PATCH 005/134] serial: 8250_bcm7271: 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/20230914183831.587273-6-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/8250/8250_bcm7271.c | 28 ++++++++++++++-------------- - 1 file changed, 14 insertions(+), 14 deletions(-) - ---- a/drivers/tty/serial/8250/8250_bcm7271.c -+++ b/drivers/tty/serial/8250/8250_bcm7271.c -@@ -567,7 +567,7 @@ static irqreturn_t brcmuart_isr(int irq, - if (interrupts == 0) - return IRQ_NONE; - -- spin_lock_irqsave(&up->lock, flags); -+ uart_port_lock_irqsave(up, &flags); - - /* Clear all interrupts */ - udma_writel(priv, REGS_DMA_ISR, UDMA_INTR_CLEAR, interrupts); -@@ -581,7 +581,7 @@ static irqreturn_t brcmuart_isr(int irq, - if ((rval | tval) == 0) - dev_warn(dev, "Spurious interrupt: 0x%x\n", interrupts); - -- spin_unlock_irqrestore(&up->lock, flags); -+ uart_port_unlock_irqrestore(up, flags); - return IRQ_HANDLED; - } - -@@ -608,10 +608,10 @@ static int brcmuart_startup(struct uart_ - * - * Synchronize UART_IER access against the console. - */ -- spin_lock_irq(&port->lock); -+ uart_port_lock_irq(port); - up->ier &= ~UART_IER_RDI; - serial_port_out(port, UART_IER, up->ier); -- spin_unlock_irq(&port->lock); -+ uart_port_unlock_irq(port); - - priv->tx_running = false; - priv->dma.rx_dma = NULL; -@@ -629,7 +629,7 @@ static void brcmuart_shutdown(struct uar - struct brcmuart_priv *priv = up->port.private_data; - unsigned long flags; - -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - priv->shutdown = true; - if (priv->dma_enabled) { - stop_rx_dma(up); -@@ -645,7 +645,7 @@ static void brcmuart_shutdown(struct uar - */ - up->dma = NULL; - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - serial8250_do_shutdown(port); - } - -@@ -788,7 +788,7 @@ static int brcmuart_handle_irq(struct ua - * interrupt but there is no data ready. - */ - if (((iir & UART_IIR_ID) == UART_IIR_RX_TIMEOUT) && !(priv->shutdown)) { -- spin_lock_irqsave(&p->lock, flags); -+ uart_port_lock_irqsave(p, &flags); - status = serial_port_in(p, UART_LSR); - if ((status & UART_LSR_DR) == 0) { - -@@ -813,7 +813,7 @@ static int brcmuart_handle_irq(struct ua - - handled = 1; - } -- spin_unlock_irqrestore(&p->lock, flags); -+ uart_port_unlock_irqrestore(p, flags); - if (handled) - return 1; - } -@@ -831,7 +831,7 @@ static enum hrtimer_restart brcmuart_hrt - if (priv->shutdown) - return HRTIMER_NORESTART; - -- spin_lock_irqsave(&p->lock, flags); -+ uart_port_lock_irqsave(p, &flags); - status = serial_port_in(p, UART_LSR); - - /* -@@ -855,7 +855,7 @@ static enum hrtimer_restart brcmuart_hrt - status |= UART_MCR_RTS; - serial_port_out(p, UART_MCR, status); - } -- spin_unlock_irqrestore(&p->lock, flags); -+ uart_port_unlock_irqrestore(p, flags); - return HRTIMER_NORESTART; - } - -@@ -1154,10 +1154,10 @@ static int __maybe_unused brcmuart_suspe - * This will prevent resume from enabling RTS before the - * baud rate has been restored. - */ -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - priv->saved_mctrl = port->mctrl; - port->mctrl &= ~TIOCM_RTS; -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - serial8250_suspend_port(priv->line); - clk_disable_unprepare(priv->baud_mux_clk); -@@ -1196,10 +1196,10 @@ static int __maybe_unused brcmuart_resum - - if (priv->saved_mctrl & TIOCM_RTS) { - /* Restore RTS */ -- spin_lock_irqsave(&port->lock, flags); -+ uart_port_lock_irqsave(port, &flags); - port->mctrl |= TIOCM_RTS; - port->ops->set_mctrl(port, port->mctrl); -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - return 0; |