mirror of
https://github.com/OpenVoiceOS/OpenVoiceOS
synced 2025-02-23 15:17:39 +01:00
86 lines
3.2 KiB
Diff
86 lines
3.2 KiB
Diff
From 18ff09af02da7e776929e679f07d525b9696cf02 Mon Sep 17 00:00:00 2001
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
Date: Thu, 14 Sep 2023 20:43:24 +0206
|
|
Subject: [PATCH 033/196] serial: 8250_dma: Use port lock wrappers
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
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>
|
|
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
|
|
Signed-off-by: John Ogness <john.ogness@linutronix.de>
|
|
Link: https://lore.kernel.org/r/20230914183831.587273-8-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_dma.c | 8 ++++----
|
|
1 file changed, 4 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
|
|
index 7fa66501792d..8b30ca8fdd3f 100644
|
|
--- a/drivers/tty/serial/8250/8250_dma.c
|
|
+++ b/drivers/tty/serial/8250/8250_dma.c
|
|
@@ -22,7 +22,7 @@ static void __dma_tx_complete(void *param)
|
|
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;
|
|
|
|
@@ -35,7 +35,7 @@ static void __dma_tx_complete(void *param)
|
|
if (ret || !dma->tx_running)
|
|
serial8250_set_THRI(p);
|
|
|
|
- spin_unlock_irqrestore(&p->port.lock, flags);
|
|
+ uart_port_unlock_irqrestore(&p->port, flags);
|
|
}
|
|
|
|
static void __dma_rx_complete(struct uart_8250_port *p)
|
|
@@ -70,7 +70,7 @@ static void dma_rx_complete(void *param)
|
|
struct uart_8250_dma *dma = p->dma;
|
|
unsigned long flags;
|
|
|
|
- spin_lock_irqsave(&p->port.lock, flags);
|
|
+ uart_port_lock_irqsave(&p->port, &flags);
|
|
if (dma->rx_running)
|
|
__dma_rx_complete(p);
|
|
|
|
@@ -80,7 +80,7 @@ static void dma_rx_complete(void *param)
|
|
*/
|
|
if (!dma->rx_running && (serial_lsr_in(p) & UART_LSR_DR))
|
|
p->dma->rx_dma(p);
|
|
- spin_unlock_irqrestore(&p->port.lock, flags);
|
|
+ uart_port_unlock_irqrestore(&p->port, flags);
|
|
}
|
|
|
|
int serial8250_tx_dma(struct uart_8250_port *p)
|
|
--
|
|
2.45.1
|
|
|