diff options
Diffstat (limited to 'debian/patches-rt/0008-serial-8250_dw-Use-port-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0008-serial-8250_dw-Use-port-lock-wrappers.patch | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/debian/patches-rt/0008-serial-8250_dw-Use-port-lock-wrappers.patch b/debian/patches-rt/0008-serial-8250_dw-Use-port-lock-wrappers.patch deleted file mode 100644 index d5394fc7a..000000000 --- a/debian/patches-rt/0008-serial-8250_dw-Use-port-lock-wrappers.patch +++ /dev/null @@ -1,69 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:25 +0206 -Subject: [PATCH 008/134] serial: 8250_dw: 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/20230914183831.587273-9-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_dw.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - ---- a/drivers/tty/serial/8250/8250_dw.c -+++ b/drivers/tty/serial/8250/8250_dw.c -@@ -263,20 +263,20 @@ static int dw8250_handle_irq(struct uart - * so we limit the workaround only to non-DMA mode. - */ - if (!up->dma && rx_timeout) { -- spin_lock_irqsave(&p->lock, flags); -+ uart_port_lock_irqsave(p, &flags); - status = serial_lsr_in(up); - - if (!(status & (UART_LSR_DR | UART_LSR_BI))) - (void) p->serial_in(p, UART_RX); - -- spin_unlock_irqrestore(&p->lock, flags); -+ uart_port_unlock_irqrestore(p, flags); - } - - /* Manually stop the Rx DMA transfer when acting as flow controller */ - if (quirks & DW_UART_QUIRK_IS_DMA_FC && up->dma && up->dma->rx_running && rx_timeout) { -- spin_lock_irqsave(&p->lock, flags); -+ uart_port_lock_irqsave(p, &flags); - status = serial_lsr_in(up); -- spin_unlock_irqrestore(&p->lock, flags); -+ uart_port_unlock_irqrestore(p, flags); - - if (status & (UART_LSR_DR | UART_LSR_BI)) { - dw8250_writel_ext(p, RZN1_UART_RDMACR, 0); |