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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
commit | 3565071f226432336a54d0193d729fa4508a3394 (patch) | |
tree | 4cde13f078f84c0a7785d234fd52edce7c90546a /debian/patches-rt/0012-serial-8250_omap-Use-port-lock-wrappers.patch | |
parent | Adding upstream version 6.6.15. (diff) | |
download | linux-3565071f226432336a54d0193d729fa4508a3394.tar.xz linux-3565071f226432336a54d0193d729fa4508a3394.zip |
Adding debian version 6.6.15-2.debian/6.6.15-2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | debian/patches-rt/0012-serial-8250_omap-Use-port-lock-wrappers.patch | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/debian/patches-rt/0012-serial-8250_omap-Use-port-lock-wrappers.patch b/debian/patches-rt/0012-serial-8250_omap-Use-port-lock-wrappers.patch new file mode 100644 index 0000000000..10ebd70ea0 --- /dev/null +++ b/debian/patches-rt/0012-serial-8250_omap-Use-port-lock-wrappers.patch @@ -0,0 +1,236 @@ +From: Thomas Gleixner <tglx@linutronix.de> +Date: Thu, 14 Sep 2023 20:43:29 +0206 +Subject: [PATCH 012/134] serial: 8250_omap: 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/20230914183831.587273-13-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_omap.c | 52 ++++++++++++++++++------------------ + 1 file changed, 26 insertions(+), 26 deletions(-) + +--- a/drivers/tty/serial/8250/8250_omap.c ++++ b/drivers/tty/serial/8250/8250_omap.c +@@ -401,7 +401,7 @@ static void omap_8250_set_termios(struct + * interrupts disabled. + */ + pm_runtime_get_sync(port->dev); +- spin_lock_irq(&port->lock); ++ uart_port_lock_irq(port); + + /* + * Update the per-port timeout. +@@ -504,7 +504,7 @@ static void omap_8250_set_termios(struct + } + omap8250_restore_regs(up); + +- spin_unlock_irq(&up->port.lock); ++ uart_port_unlock_irq(&up->port); + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + +@@ -529,7 +529,7 @@ static void omap_8250_pm(struct uart_por + pm_runtime_get_sync(port->dev); + + /* Synchronize UART_IER access against the console. */ +- spin_lock_irq(&port->lock); ++ uart_port_lock_irq(port); + + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + efr = serial_in(up, UART_EFR); +@@ -541,7 +541,7 @@ static void omap_8250_pm(struct uart_por + serial_out(up, UART_EFR, efr); + serial_out(up, UART_LCR, 0); + +- spin_unlock_irq(&port->lock); ++ uart_port_unlock_irq(port); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +@@ -660,7 +660,7 @@ static irqreturn_t omap8250_irq(int irq, + unsigned long delay; + + /* Synchronize UART_IER access against the console. */ +- spin_lock(&port->lock); ++ uart_port_lock(port); + up->ier = port->serial_in(port, UART_IER); + if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) { + port->ops->stop_rx(port); +@@ -670,7 +670,7 @@ static irqreturn_t omap8250_irq(int irq, + */ + cancel_delayed_work(&up->overrun_backoff); + } +- spin_unlock(&port->lock); ++ uart_port_unlock(port); + + delay = msecs_to_jiffies(up->overrun_backoff_time_ms); + schedule_delayed_work(&up->overrun_backoff, delay); +@@ -717,10 +717,10 @@ static int omap_8250_startup(struct uart + } + + /* Synchronize UART_IER access against the console. */ +- spin_lock_irq(&port->lock); ++ uart_port_lock_irq(port); + up->ier = UART_IER_RLSI | UART_IER_RDI; + serial_out(up, UART_IER, up->ier); +- spin_unlock_irq(&port->lock); ++ uart_port_unlock_irq(port); + + #ifdef CONFIG_PM + up->capabilities |= UART_CAP_RPM; +@@ -733,9 +733,9 @@ static int omap_8250_startup(struct uart + serial_out(up, UART_OMAP_WER, priv->wer); + + if (up->dma && !(priv->habit & UART_HAS_EFR2)) { +- spin_lock_irq(&port->lock); ++ uart_port_lock_irq(port); + up->dma->rx_dma(up); +- spin_unlock_irq(&port->lock); ++ uart_port_unlock_irq(port); + } + + enable_irq(up->port.irq); +@@ -761,10 +761,10 @@ static void omap_8250_shutdown(struct ua + serial_out(up, UART_OMAP_EFR2, 0x0); + + /* Synchronize UART_IER access against the console. */ +- spin_lock_irq(&port->lock); ++ uart_port_lock_irq(port); + up->ier = 0; + serial_out(up, UART_IER, 0); +- spin_unlock_irq(&port->lock); ++ uart_port_unlock_irq(port); + disable_irq_nosync(up->port.irq); + dev_pm_clear_wake_irq(port->dev); + +@@ -789,10 +789,10 @@ static void omap_8250_throttle(struct ua + + pm_runtime_get_sync(port->dev); + +- spin_lock_irqsave(&port->lock, flags); ++ uart_port_lock_irqsave(port, &flags); + port->ops->stop_rx(port); + priv->throttled = true; +- spin_unlock_irqrestore(&port->lock, flags); ++ uart_port_unlock_irqrestore(port, flags); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +@@ -807,14 +807,14 @@ static void omap_8250_unthrottle(struct + pm_runtime_get_sync(port->dev); + + /* Synchronize UART_IER access against the console. */ +- spin_lock_irqsave(&port->lock, flags); ++ uart_port_lock_irqsave(port, &flags); + priv->throttled = false; + if (up->dma) + up->dma->rx_dma(up); + up->ier |= UART_IER_RLSI | UART_IER_RDI; + port->read_status_mask |= UART_LSR_DR; + serial_out(up, UART_IER, up->ier); +- spin_unlock_irqrestore(&port->lock, flags); ++ uart_port_unlock_irqrestore(port, flags); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +@@ -958,7 +958,7 @@ static void __dma_rx_complete(void *para + unsigned long flags; + + /* Synchronize UART_IER access against the console. */ +- spin_lock_irqsave(&p->port.lock, flags); ++ uart_port_lock_irqsave(&p->port, &flags); + + /* + * If the tx status is not DMA_COMPLETE, then this is a delayed +@@ -967,7 +967,7 @@ static void __dma_rx_complete(void *para + */ + if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) != + DMA_COMPLETE) { +- spin_unlock_irqrestore(&p->port.lock, flags); ++ uart_port_unlock_irqrestore(&p->port, flags); + return; + } + __dma_rx_do_complete(p); +@@ -978,7 +978,7 @@ static void __dma_rx_complete(void *para + omap_8250_rx_dma(p); + } + +- spin_unlock_irqrestore(&p->port.lock, flags); ++ uart_port_unlock_irqrestore(&p->port, flags); + } + + static void omap_8250_rx_dma_flush(struct uart_8250_port *p) +@@ -1083,7 +1083,7 @@ static void omap_8250_dma_tx_complete(vo + dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, + UART_XMIT_SIZE, DMA_TO_DEVICE); + +- spin_lock_irqsave(&p->port.lock, flags); ++ uart_port_lock_irqsave(&p->port, &flags); + + dma->tx_running = 0; + +@@ -1112,7 +1112,7 @@ static void omap_8250_dma_tx_complete(vo + serial8250_set_THRI(p); + } + +- spin_unlock_irqrestore(&p->port.lock, flags); ++ uart_port_unlock_irqrestore(&p->port, flags); + } + + static int omap_8250_tx_dma(struct uart_8250_port *p) +@@ -1278,7 +1278,7 @@ static int omap_8250_dma_handle_irq(stru + return IRQ_HANDLED; + } + +- spin_lock(&port->lock); ++ uart_port_lock(port); + + status = serial_port_in(port, UART_LSR); + +@@ -1756,15 +1756,15 @@ static int omap8250_runtime_resume(struc + up = serial8250_get_port(priv->line); + + if (up && omap8250_lost_context(up)) { +- spin_lock_irq(&up->port.lock); ++ uart_port_lock_irq(&up->port); + omap8250_restore_regs(up); +- spin_unlock_irq(&up->port.lock); ++ uart_port_unlock_irq(&up->port); + } + + if (up && up->dma && up->dma->rxchan && !(priv->habit & UART_HAS_EFR2)) { +- spin_lock_irq(&up->port.lock); ++ uart_port_lock_irq(&up->port); + omap_8250_rx_dma(up); +- spin_unlock_irq(&up->port.lock); ++ uart_port_unlock_irq(&up->port); + } + + priv->latency = priv->calc_latency; |