diff options
Diffstat (limited to 'debian/patches-rt/0005-serial-msm-Use-uart_prepare_sysrq_char.patch')
| -rw-r--r-- | debian/patches-rt/0005-serial-msm-Use-uart_prepare_sysrq_char.patch | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/debian/patches-rt/0005-serial-msm-Use-uart_prepare_sysrq_char.patch b/debian/patches-rt/0005-serial-msm-Use-uart_prepare_sysrq_char.patch deleted file mode 100644 index 75c822db47..0000000000 --- a/debian/patches-rt/0005-serial-msm-Use-uart_prepare_sysrq_char.patch +++ /dev/null @@ -1,116 +0,0 @@ -From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> -Date: Fri, 1 Mar 2024 22:45:18 +0100 -Subject: [PATCH 05/18] serial: msm: Use uart_prepare_sysrq_char(). -Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz - -The port lock is a spinlock_t which is becomes a sleeping lock on PREEMPT_RT. -The driver splits the locking function into two parts: local_irq_save() and -uart_port_lock() and this breaks PREEMPT_RT. - -Delay handling sysrq until port lock is dropped. -Remove the special case in the console write routine an always use the -complete locking function. - -Cc: Bjorn Andersson <andersson@kernel.org> -Cc: Konrad Dybcio <konrad.dybcio@linaro.org> -Cc: linux-arm-msm@vger.kernel.org -Link: https://lore.kernel.org/r/20240301215246.891055-6-bigeasy@linutronix.de -Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> ---- - drivers/tty/serial/msm_serial.c | 33 ++++++++++----------------------- - 1 file changed, 10 insertions(+), 23 deletions(-) - ---- a/drivers/tty/serial/msm_serial.c -+++ b/drivers/tty/serial/msm_serial.c -@@ -588,16 +588,14 @@ static void msm_complete_rx_dma(void *ar - if (!(port->read_status_mask & MSM_UART_SR_RX_BREAK)) - flag = TTY_NORMAL; - -- uart_port_unlock_irqrestore(port, flags); -- sysrq = uart_handle_sysrq_char(port, dma->virt[i]); -- uart_port_lock_irqsave(port, &flags); -+ sysrq = uart_prepare_sysrq_char(port, dma->virt[i]); - if (!sysrq) - tty_insert_flip_char(tport, dma->virt[i], flag); - } - - msm_start_rx_dma(msm_port); - done: -- uart_port_unlock_irqrestore(port, flags); -+ uart_unlock_and_check_sysrq_irqrestore(port, flags); - - if (count) - tty_flip_buffer_push(tport); -@@ -763,9 +761,7 @@ static void msm_handle_rx_dm(struct uart - if (!(port->read_status_mask & MSM_UART_SR_RX_BREAK)) - flag = TTY_NORMAL; - -- uart_port_unlock(port); -- sysrq = uart_handle_sysrq_char(port, buf[i]); -- uart_port_lock(port); -+ sysrq = uart_prepare_sysrq_char(port, buf[i]); - if (!sysrq) - tty_insert_flip_char(tport, buf[i], flag); - } -@@ -825,9 +821,7 @@ static void msm_handle_rx(struct uart_po - else if (sr & MSM_UART_SR_PAR_FRAME_ERR) - flag = TTY_FRAME; - -- uart_port_unlock(port); -- sysrq = uart_handle_sysrq_char(port, c); -- uart_port_lock(port); -+ sysrq = uart_prepare_sysrq_char(port, c); - if (!sysrq) - tty_insert_flip_char(tport, c, flag); - } -@@ -948,11 +942,10 @@ static irqreturn_t msm_uart_irq(int irq, - struct uart_port *port = dev_id; - struct msm_port *msm_port = to_msm_port(port); - struct msm_dma *dma = &msm_port->rx_dma; -- unsigned long flags; - unsigned int misr; - u32 val; - -- uart_port_lock_irqsave(port, &flags); -+ uart_port_lock(port); - misr = msm_read(port, MSM_UART_MISR); - msm_write(port, 0, MSM_UART_IMR); /* disable interrupt */ - -@@ -984,7 +977,7 @@ static irqreturn_t msm_uart_irq(int irq, - msm_handle_delta_cts(port); - - msm_write(port, msm_port->imr, MSM_UART_IMR); /* restore interrupt */ -- uart_port_unlock_irqrestore(port, flags); -+ uart_unlock_and_check_sysrq(port); - - return IRQ_HANDLED; - } -@@ -1621,14 +1614,10 @@ static void __msm_console_write(struct u - num_newlines++; - count += num_newlines; - -- local_irq_save(flags); -- -- if (port->sysrq) -- locked = 0; -- else if (oops_in_progress) -- locked = uart_port_trylock(port); -+ if (oops_in_progress) -+ locked = uart_port_trylock_irqsave(port, &flags); - else -- uart_port_lock(port); -+ uart_port_lock_irqsave(port, &flags); - - if (is_uartdm) - msm_reset_dm_count(port, count); -@@ -1667,9 +1656,7 @@ static void __msm_console_write(struct u - } - - if (locked) -- uart_port_unlock(port); -- -- local_irq_restore(flags); -+ uart_port_unlock_irqrestore(port, flags); - } - - static void msm_console_write(struct console *co, const char *s, |