From 75f4e830fa9c47637054a3b7201765f2a314bda2 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Fri, 16 Apr 2021 16:05:55 +0200 Subject: serial: do not restore interrupt state in sysrq helper The uart_unlock_and_check_sysrq() helper can be used to defer processing of sysrq until the interrupt handler has released the port lock and is about to return. Since commit 81e2073c175b ("genirq: Disable interrupts for force threaded handlers") interrupt handlers that are not explicitly requested as threaded are always called with interrupts disabled and there is no need to save the interrupt state when taking the port lock. Instead of adding another sysrq helper for when the interrupt state has not needlessly been saved, drop the state parameter from uart_unlock_and_check_sysrq() and update its callers to no longer explicitly disable interrupts in their interrupt handlers. Cc: Joel Stanley Cc: Andrew Jeffery Cc: Andy Gross Cc: Bjorn Andersson Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20210416140557.25177-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_aspeed_vuart.c | 5 ++--- drivers/tty/serial/8250/8250_fsl.c | 11 ++++++----- drivers/tty/serial/8250/8250_omap.c | 6 +++--- drivers/tty/serial/8250/8250_port.c | 6 +++--- drivers/tty/serial/qcom_geni_serial.c | 6 +++--- 5 files changed, 17 insertions(+), 17 deletions(-) (limited to 'drivers') diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c index 3c239d98747f..61550f24a2d3 100644 --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c @@ -320,7 +320,6 @@ static int aspeed_vuart_handle_irq(struct uart_port *port) { struct uart_8250_port *up = up_to_u8250p(port); unsigned int iir, lsr; - unsigned long flags; int space, count; iir = serial_port_in(port, UART_IIR); @@ -328,7 +327,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port) if (iir & UART_IIR_NO_INT) return 0; - spin_lock_irqsave(&port->lock, flags); + spin_lock(&port->lock); lsr = serial_port_in(port, UART_LSR); @@ -364,7 +363,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port) if (lsr & UART_LSR_THRE) serial8250_tx_chars(up); - uart_unlock_and_check_sysrq(port, flags); + uart_unlock_and_check_sysrq(port); return 1; } diff --git a/drivers/tty/serial/8250/8250_fsl.c b/drivers/tty/serial/8250/8250_fsl.c index cd19400b65ae..4e75d2e4f87c 100644 --- a/drivers/tty/serial/8250/8250_fsl.c +++ b/drivers/tty/serial/8250/8250_fsl.c @@ -30,15 +30,14 @@ struct fsl8250_data { int fsl8250_handle_irq(struct uart_port *port) { unsigned char lsr, orig_lsr; - unsigned long flags; unsigned int iir; struct uart_8250_port *up = up_to_u8250p(port); - spin_lock_irqsave(&up->port.lock, flags); + spin_lock(&up->port.lock); iir = port->serial_in(port, UART_IIR); if (iir & UART_IIR_NO_INT) { - spin_unlock_irqrestore(&up->port.lock, flags); + spin_unlock(&up->port.lock); return 0; } @@ -46,7 +45,7 @@ int fsl8250_handle_irq(struct uart_port *port) if (unlikely(up->lsr_saved_flags & UART_LSR_BI)) { up->lsr_saved_flags &= ~UART_LSR_BI; port->serial_in(port, UART_RX); - spin_unlock_irqrestore(&up->port.lock, flags); + spin_unlock(&up->port.lock); return 1; } @@ -82,7 +81,9 @@ int fsl8250_handle_irq(struct uart_port *port) serial8250_tx_chars(up); up->lsr_saved_flags = orig_lsr; - uart_unlock_and_check_sysrq(&up->port, flags); + + uart_unlock_and_check_sysrq(&up->port); + return 1; } EXPORT_SYMBOL_GPL(fsl8250_handle_irq); diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 23e0decde33e..8ac11eaeca51 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -1143,7 +1143,6 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) struct uart_8250_port *up = up_to_u8250p(port); struct omap8250_priv *priv = up->port.private_data; unsigned char status; - unsigned long flags; u8 iir; serial8250_rpm_get(up); @@ -1154,7 +1153,7 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) return IRQ_HANDLED; } - spin_lock_irqsave(&port->lock, flags); + spin_lock(&port->lock); status = serial_port_in(port, UART_LSR); @@ -1179,7 +1178,8 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) } } - uart_unlock_and_check_sysrq(port, flags); + uart_unlock_and_check_sysrq(port); + serial8250_rpm_put(up); return 1; } diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 9019f8f626bb..d45dab1ab316 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1879,14 +1879,13 @@ static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir) int serial8250_handle_irq(struct uart_port *port, unsigned int iir) { unsigned char status; - unsigned long flags; struct uart_8250_port *up = up_to_u8250p(port); bool skip_rx = false; if (iir & UART_IIR_NO_INT) return 0; - spin_lock_irqsave(&port->lock, flags); + spin_lock(&port->lock); status = serial_port_in(port, UART_LSR); @@ -1912,7 +1911,8 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir) (up->ier & UART_IER_THRI)) serial8250_tx_chars(up); - uart_unlock_and_check_sysrq(port, flags); + uart_unlock_and_check_sysrq(port); + return 1; } EXPORT_SYMBOL_GPL(serial8250_handle_irq); diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 0d85b55ea823..00bb88a71606 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -818,7 +818,6 @@ static irqreturn_t qcom_geni_serial_isr(int isr, void *dev) u32 s_irq_status; u32 geni_status; struct uart_port *uport = dev; - unsigned long flags; bool drop_rx = false; struct tty_port *tport = &uport->state->port; struct qcom_geni_serial_port *port = to_dev_port(uport, uport); @@ -826,7 +825,8 @@ static irqreturn_t qcom_geni_serial_isr(int isr, void *dev) if (uport->suspended) return IRQ_NONE; - spin_lock_irqsave(&uport->lock, flags); + spin_lock(&uport->lock); + m_irq_status = readl(uport->membase + SE_GENI_M_IRQ_STATUS); s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS); geni_status = readl(uport->membase + SE_GENI_STATUS); @@ -861,7 +861,7 @@ static irqreturn_t qcom_geni_serial_isr(int isr, void *dev) qcom_geni_serial_handle_rx(uport, drop_rx); out_unlock: - uart_unlock_and_check_sysrq(uport, flags); + uart_unlock_and_check_sysrq(uport); return IRQ_HANDLED; } -- cgit v1.2.3