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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
commit | 3565071f226432336a54d0193d729fa4508a3394 (patch) | |
tree | 4cde13f078f84c0a7785d234fd52edce7c90546a /debian/patches-rt/0068-serial-sunsu-Use-port-lock-wrappers.patch | |
parent | Adding upstream version 6.6.15. (diff) | |
download | linux-3565071f226432336a54d0193d729fa4508a3394.tar.xz linux-3565071f226432336a54d0193d729fa4508a3394.zip |
Adding debian version 6.6.15-2.debian/6.6.15-2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | debian/patches-rt/0068-serial-sunsu-Use-port-lock-wrappers.patch | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/debian/patches-rt/0068-serial-sunsu-Use-port-lock-wrappers.patch b/debian/patches-rt/0068-serial-sunsu-Use-port-lock-wrappers.patch new file mode 100644 index 0000000000..77945a1edb --- /dev/null +++ b/debian/patches-rt/0068-serial-sunsu-Use-port-lock-wrappers.patch @@ -0,0 +1,219 @@ +From: Thomas Gleixner <tglx@linutronix.de> +Date: Thu, 14 Sep 2023 20:44:25 +0206 +Subject: [PATCH 068/134] serial: sunsu: Use port lock wrappers +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> +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Link: https://lore.kernel.org/r/20230914183831.587273-69-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/sunsu.c | 46 ++++++++++++++++++++++----------------------- + 1 file changed, 23 insertions(+), 23 deletions(-) + +--- a/drivers/tty/serial/sunsu.c ++++ b/drivers/tty/serial/sunsu.c +@@ -212,9 +212,9 @@ static void enable_rsa(struct uart_sunsu + { + if (up->port.type == PORT_RSA) { + if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { +- spin_lock_irq(&up->port.lock); ++ uart_port_lock_irq(&up->port); + __enable_rsa(up); +- spin_unlock_irq(&up->port.lock); ++ uart_port_unlock_irq(&up->port); + } + if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) + serial_outp(up, UART_RSA_FRR, 0); +@@ -234,7 +234,7 @@ static void disable_rsa(struct uart_suns + + if (up->port.type == PORT_RSA && + up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { +- spin_lock_irq(&up->port.lock); ++ uart_port_lock_irq(&up->port); + + mode = serial_inp(up, UART_RSA_MSR); + result = !(mode & UART_RSA_MSR_FIFO); +@@ -247,7 +247,7 @@ static void disable_rsa(struct uart_suns + + if (result) + up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; +- spin_unlock_irq(&up->port.lock); ++ uart_port_unlock_irq(&up->port); + } + } + #endif /* CONFIG_SERIAL_8250_RSA */ +@@ -311,10 +311,10 @@ static void sunsu_enable_ms(struct uart_ + container_of(port, struct uart_sunsu_port, port); + unsigned long flags; + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + up->ier |= UART_IER_MSI; + serial_out(up, UART_IER, up->ier); +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + static void +@@ -456,7 +456,7 @@ static irqreturn_t sunsu_serial_interrup + unsigned long flags; + unsigned char status; + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + do { + status = serial_inp(up, UART_LSR); +@@ -470,7 +470,7 @@ static irqreturn_t sunsu_serial_interrup + + } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)); + +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + + return IRQ_HANDLED; + } +@@ -545,9 +545,9 @@ static unsigned int sunsu_tx_empty(struc + unsigned long flags; + unsigned int ret; + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + + return ret; + } +@@ -599,13 +599,13 @@ static void sunsu_break_ctl(struct uart_ + container_of(port, struct uart_sunsu_port, port); + unsigned long flags; + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + if (break_state == -1) + up->lcr |= UART_LCR_SBC; + else + up->lcr &= ~UART_LCR_SBC; + serial_out(up, UART_LCR, up->lcr); +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + static int sunsu_startup(struct uart_port *port) +@@ -683,12 +683,12 @@ static int sunsu_startup(struct uart_por + */ + serial_outp(up, UART_LCR, UART_LCR_WLEN8); + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + up->port.mctrl |= TIOCM_OUT2; + + sunsu_set_mctrl(&up->port, up->port.mctrl); +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + + /* + * Finally, enable interrupts. Note: Modem status interrupts +@@ -731,7 +731,7 @@ static void sunsu_shutdown(struct uart_p + up->ier = 0; + serial_outp(up, UART_IER, 0); + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + if (up->port.flags & UPF_FOURPORT) { + /* reset interrupts on the AST Fourport board */ + inb((up->port.iobase & 0xfe0) | 0x1f); +@@ -740,7 +740,7 @@ static void sunsu_shutdown(struct uart_p + up->port.mctrl &= ~TIOCM_OUT2; + + sunsu_set_mctrl(&up->port, up->port.mctrl); +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + + /* + * Disable break condition and FIFOs +@@ -826,7 +826,7 @@ sunsu_change_speed(struct uart_port *por + * Ok, we're now changing the port state. Do it with + * interrupts disabled. + */ +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + /* + * Update the per-port timeout. +@@ -891,7 +891,7 @@ sunsu_change_speed(struct uart_port *por + + up->cflag = cflag; + +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + static void +@@ -1038,7 +1038,7 @@ static void sunsu_autoconfig(struct uart + up->type_probed = PORT_UNKNOWN; + up->port.iotype = UPIO_MEM; + +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + if (!(up->port.flags & UPF_BUGGY_UART)) { + /* +@@ -1173,7 +1173,7 @@ static void sunsu_autoconfig(struct uart + serial_outp(up, UART_IER, 0); + + out: +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + static struct uart_driver sunsu_reg = { +@@ -1298,9 +1298,9 @@ static void sunsu_console_write(struct c + int locked = 1; + + if (up->port.sysrq || oops_in_progress) +- locked = spin_trylock_irqsave(&up->port.lock, flags); ++ locked = uart_port_trylock_irqsave(&up->port, &flags); + else +- spin_lock_irqsave(&up->port.lock, flags); ++ uart_port_lock_irqsave(&up->port, &flags); + + /* + * First save the UER then disable the interrupts +@@ -1318,7 +1318,7 @@ static void sunsu_console_write(struct c + serial_out(up, UART_IER, ier); + + if (locked) +- spin_unlock_irqrestore(&up->port.lock, flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + /* |