diff options
Diffstat (limited to 'debian/patches-rt/0012-serial-sifive-Use-uart_prepare_sysrq_char-to-handle-.patch')
| -rw-r--r-- | debian/patches-rt/0012-serial-sifive-Use-uart_prepare_sysrq_char-to-handle-.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/debian/patches-rt/0012-serial-sifive-Use-uart_prepare_sysrq_char-to-handle-.patch b/debian/patches-rt/0012-serial-sifive-Use-uart_prepare_sysrq_char-to-handle-.patch deleted file mode 100644 index 5b82468e4..000000000 --- a/debian/patches-rt/0012-serial-sifive-Use-uart_prepare_sysrq_char-to-handle-.patch +++ /dev/null @@ -1,71 +0,0 @@ -From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> -Date: Fri, 1 Mar 2024 22:45:25 +0100 -Subject: [PATCH 12/18] serial: sifive: Use uart_prepare_sysrq_char() to handle - sysrq. -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. - -Handle sysrq requests sysrq once the port lock is dropped. -Remove the special case in the console write routine an always use the -complete locking function. - -Cc: Palmer Dabbelt <palmer@dabbelt.com> -Cc: Paul Walmsley <paul.walmsley@sifive.com> -Cc: linux-riscv@lists.infradead.org -Link: https://lore.kernel.org/r/20240301215246.891055-13-bigeasy@linutronix.de -Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> ---- - drivers/tty/serial/sifive.c | 17 +++++++---------- - 1 file changed, 7 insertions(+), 10 deletions(-) - ---- a/drivers/tty/serial/sifive.c -+++ b/drivers/tty/serial/sifive.c -@@ -412,7 +412,8 @@ static void __ssp_receive_chars(struct s - break; - - ssp->port.icount.rx++; -- uart_insert_char(&ssp->port, 0, 0, ch, TTY_NORMAL); -+ if (!uart_prepare_sysrq_char(&ssp->port, ch)) -+ uart_insert_char(&ssp->port, 0, 0, ch, TTY_NORMAL); - } - - tty_flip_buffer_push(&ssp->port.state->port); -@@ -534,7 +535,7 @@ static irqreturn_t sifive_serial_irq(int - if (ip & SIFIVE_SERIAL_IP_TXWM_MASK) - __ssp_transmit_chars(ssp); - -- uart_port_unlock(&ssp->port); -+ uart_unlock_and_check_sysrq(&ssp->port); - - return IRQ_HANDLED; - } -@@ -791,13 +792,10 @@ static void sifive_serial_console_write( - if (!ssp) - return; - -- local_irq_save(flags); -- if (ssp->port.sysrq) -- locked = 0; -- else if (oops_in_progress) -- locked = uart_port_trylock(&ssp->port); -+ if (oops_in_progress) -+ locked = uart_port_trylock_irqsave(&ssp->port, &flags); - else -- uart_port_lock(&ssp->port); -+ uart_port_lock_irqsave(&ssp->port, &flags); - - ier = __ssp_readl(ssp, SIFIVE_SERIAL_IE_OFFS); - __ssp_writel(0, SIFIVE_SERIAL_IE_OFFS, ssp); -@@ -807,8 +805,7 @@ static void sifive_serial_console_write( - __ssp_writel(ier, SIFIVE_SERIAL_IE_OFFS, ssp); - - if (locked) -- uart_port_unlock(&ssp->port); -- local_irq_restore(flags); -+ uart_port_unlock_irqrestore(&ssp->port, flags); - } - - static int sifive_serial_console_setup(struct console *co, char *options) |