diff options
Diffstat (limited to 'debian/patches-rt/0007-serial-8250_dma-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0007-serial-8250_dma-Use-port-lock-wrappers.patch | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/debian/patches-rt/0007-serial-8250_dma-Use-port-lock-wrappers.patch b/debian/patches-rt/0007-serial-8250_dma-Use-port-lock-wrappers.patch deleted file mode 100644 index bc8686e892..0000000000 --- a/debian/patches-rt/0007-serial-8250_dma-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,80 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:24 +0206 -Subject: [PATCH 007/134] serial: 8250_dma: Use port lock wrappers -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit -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> -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(-) - ---- 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 *para - 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 *para - 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) |