Merge 6.9-rc5 into tty-next

We want the tty fixes in here as well, and it resolves a merge conflict
in:
	drivers/tty/serial/serial_core.c
as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9 files changed, 77 insertions, 32 deletions

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index db0e67186a8b..ba9f4dc4e71d 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -343,9 +343,9 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 	long rate;
 	int ret;
 
+	clk_disable_unprepare(d->clk);
 	rate = clk_round_rate(d->clk, newrate);
-	if (rate > 0 && p->uartclk != rate) {
-		clk_disable_unprepare(d->clk);
+	if (rate > 0) {
 		/*
 		 * Note that any clock-notifer worker will block in
 		 * serial8250_update_uartclk() until we are done.
@@ -353,8 +353,8 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 		ret = clk_set_rate(d->clk, newrate);
 		if (!ret)
 			p->uartclk = rate;
-		clk_prepare_enable(d->clk);
 	}
+	clk_prepare_enable(d->clk);
 
 	dw8250_do_set_termios(p, termios, old);
 }
diff --git a/drivers/tty/serial/8250/8250_lpc18xx.c b/drivers/tty/serial/8250/8250_lpc18xx.c
index 7984ee05af1d..47e1a056a60c 100644
--- a/drivers/tty/serial/8250/8250_lpc18xx.c
+++ b/drivers/tty/serial/8250/8250_lpc18xx.c
@@ -151,7 +151,7 @@ static int lpc18xx_serial_probe(struct platform_device *pdev)
 
 	ret = uart_read_port_properties(&uart.port);
 	if (ret)
-		return ret;
+		goto dis_uart_clk;
 
 	uart.port.iotype = UPIO_MEM32;
 	uart.port.regshift = 2;
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 0d35c77fad9e..e2e4f99f9d34 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -5010,12 +5010,6 @@ static const struct pci_device_id serial_pci_tbl[] = {
 	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_B,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_b0_bt_2_115200 },
-	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_A,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_b0_bt_2_115200 },
-	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_B,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_b0_bt_2_115200 },
 	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_OCTO_A,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_b0_bt_4_460800 },
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 144b35d31497..a1c76565c399 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1075,11 +1075,13 @@ static void mxs_auart_set_ldisc(struct uart_port *port,
 
 static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
 {
-	u32 istat;
+	u32 istat, stat;
 	struct mxs_auart_port *s = context;
 	u32 mctrl_temp = s->mctrl_prev;
-	u32 stat = mxs_read(s, REG_STAT);
 
+	uart_port_lock(&s->port);
+
+	stat = mxs_read(s, REG_STAT);
 	istat = mxs_read(s, REG_INTR);
 
 	/* ack irq */
@@ -1115,6 +1117,8 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
 		istat &= ~AUART_INTR_TXIS;
 	}
 
+	uart_port_unlock(&s->port);
+
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index b6909dcb137d..8969b11cc0a9 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -210,7 +210,6 @@ static bool pmz_receive_chars(struct uart_pmac_port *uap)
 {
 	struct tty_port *port;
 	unsigned char ch, r1, drop, flag;
-	int loops = 0;
 
 	/* Sanity check, make sure the old bug is no longer happening */
 	if (uap->port.state == NULL) {
@@ -291,25 +290,12 @@ static bool pmz_receive_chars(struct uart_pmac_port *uap)
 		if (r1 & Rx_OVR)
 			tty_insert_flip_char(port, 0, TTY_OVERRUN);
 	next_char:
-		/* We can get stuck in an infinite loop getting char 0 when the
-		 * line is in a wrong HW state, we break that here.
-		 * When that happens, I disable the receive side of the driver.
-		 * Note that what I've been experiencing is a real irq loop where
-		 * I'm getting flooded regardless of the actual port speed.
-		 * Something strange is going on with the HW
-		 */
-		if ((++loops) > 1000)
-			goto flood;
 		ch = read_zsreg(uap, R0);
 		if (!(ch & Rx_CH_AV))
 			break;
 	}
 
 	return true;
- flood:
-	pmz_interrupt_control(uap, 0);
-	pmz_error("pmz: rx irq flood !\n");
-	return true;
 }
 
 static void pmz_status_handle(struct uart_pmac_port *uap)
diff --git a/drivers/tty/serial/serial_base.h b/drivers/tty/serial/serial_base.h
index ab6f1876726c..743a72ac34f3 100644
--- a/drivers/tty/serial/serial_base.h
+++ b/drivers/tty/serial/serial_base.h
@@ -22,6 +22,7 @@ struct serial_ctrl_device {
 struct serial_port_device {
 	struct device dev;
 	struct uart_port *port;
+	unsigned int tx_enabled:1;
 };
 
 int serial_base_ctrl_init(void);
@@ -30,6 +31,9 @@ void serial_base_ctrl_exit(void);
 int serial_base_port_init(void);
 void serial_base_port_exit(void);
 
+void serial_base_port_startup(struct uart_port *port);
+void serial_base_port_shutdown(struct uart_port *port);
+
 int serial_base_driver_register(struct device_driver *driver);
 void serial_base_driver_unregister(struct device_driver *driver);
 
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b9d631037ff6..8a76f378c445 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -156,7 +156,7 @@ static void __uart_start(struct uart_state *state)
 	 * enabled, serial_port_runtime_resume() calls start_tx() again
 	 * after enabling the device.
 	 */
-	if (pm_runtime_active(&port_dev->dev))
+	if (!pm_runtime_enabled(port->dev) || pm_runtime_active(&port_dev->dev))
 		port->ops->start_tx(port);
 	pm_runtime_mark_last_busy(&port_dev->dev);
 	pm_runtime_put_autosuspend(&port_dev->dev);
@@ -358,16 +358,26 @@ static int uart_startup(struct tty_struct *tty, struct uart_state *state,
 			bool init_hw)
 {
 	struct tty_port *port = &state->port;
+	struct uart_port *uport;
 	int retval;
 
 	if (tty_port_initialized(port))
-		return 0;
+		goto out_base_port_startup;
 
 	retval = uart_port_startup(tty, state, init_hw);
-	if (retval)
+	if (retval) {
 		set_bit(TTY_IO_ERROR, &tty->flags);
+		return retval;
+	}
 
-	return retval;
+out_base_port_startup:
+	uport = uart_port_check(state);
+	if (!uport)
+		return -EIO;
+
+	serial_base_port_startup(uport);
+
+	return 0;
 }
 
 /*
@@ -388,6 +398,9 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 	if (tty)
 		set_bit(TTY_IO_ERROR, &tty->flags);
 
+	if (uport)
+		serial_base_port_shutdown(uport);
+
 	if (tty_port_initialized(port)) {
 		tty_port_set_initialized(port, false);
 
@@ -1779,6 +1792,7 @@ static void uart_tty_port_shutdown(struct tty_port *port)
 	uport->ops->stop_rx(uport);
 	uart_port_unlock_irq(uport);
 
+	serial_base_port_shutdown(uport);
 	uart_port_shutdown(port);
 
 	/*
diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
index 47dd8c3fd06d..91a338d3cb34 100644
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -40,8 +40,12 @@ static int serial_port_runtime_resume(struct device *dev)
 
 	/* Flush any pending TX for the port */
 	uart_port_lock_irqsave(port, &flags);
+	if (!port_dev->tx_enabled)
+		goto unlock;
 	if (__serial_port_busy(port))
 		port->ops->start_tx(port);
+
+unlock:
 	uart_port_unlock_irqrestore(port, flags);
 
 out:
@@ -61,6 +65,11 @@ static int serial_port_runtime_suspend(struct device *dev)
 		return 0;
 
 	uart_port_lock_irqsave(port, &flags);
+	if (!port_dev->tx_enabled) {
+		uart_port_unlock_irqrestore(port, flags);
+		return 0;
+	}
+
 	busy = __serial_port_busy(port);
 	if (busy)
 		port->ops->start_tx(port);
@@ -72,6 +81,31 @@ static int serial_port_runtime_suspend(struct device *dev)
 	return busy ? -EBUSY : 0;
 }
 
+static void serial_base_port_set_tx(struct uart_port *port,
+				    struct serial_port_device *port_dev,
+				    bool enabled)
+{
+	unsigned long flags;
+
+	uart_port_lock_irqsave(port, &flags);
+	port_dev->tx_enabled = enabled;
+	uart_port_unlock_irqrestore(port, flags);
+}
+
+void serial_base_port_startup(struct uart_port *port)
+{
+	struct serial_port_device *port_dev = port->port_dev;
+
+	serial_base_port_set_tx(port, port_dev, true);
+}
+
+void serial_base_port_shutdown(struct uart_port *port)
+{
+	struct serial_port_device *port_dev = port->port_dev;
+
+	serial_base_port_set_tx(port, port_dev, false);
+}
+
 static DEFINE_RUNTIME_DEV_PM_OPS(serial_port_pm,
 				 serial_port_runtime_suspend,
 				 serial_port_runtime_resume, NULL);
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 8c66abcfe6ca..e1e7bc04c579 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -849,6 +849,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 	const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
 	u32 sr;
 	unsigned int size;
+	irqreturn_t ret = IRQ_NONE;
 
 	sr = readl_relaxed(port->membase + ofs->isr);
 
@@ -857,11 +858,14 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 	    (sr & USART_SR_TC)) {
 		stm32_usart_tc_interrupt_disable(port);
 		stm32_usart_rs485_rts_disable(port);
+		ret = IRQ_HANDLED;
 	}
 
-	if ((sr & USART_SR_RTOF) && ofs->icr != UNDEF_REG)
+	if ((sr & USART_SR_RTOF) && ofs->icr != UNDEF_REG) {
 		writel_relaxed(USART_ICR_RTOCF,
 			       port->membase + ofs->icr);
+		ret = IRQ_HANDLED;
+	}
 
 	if ((sr & USART_SR_WUF) && ofs->icr != UNDEF_REG) {
 		/* Clear wake up flag and disable wake up interrupt */
@@ -870,6 +874,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 		stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_WUFIE);
 		if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
 			pm_wakeup_event(tport->tty->dev, 0);
+		ret = IRQ_HANDLED;
 	}
 
 	/*
@@ -884,6 +889,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 			uart_unlock_and_check_sysrq(port);
 			if (size)
 				tty_flip_buffer_push(tport);
+			ret = IRQ_HANDLED;
 		}
 	}
 
@@ -891,6 +897,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 		uart_port_lock(port);
 		stm32_usart_transmit_chars(port);
 		uart_port_unlock(port);
+		ret = IRQ_HANDLED;
 	}
 
 	/* Receiver timeout irq for DMA RX */
@@ -900,9 +907,10 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
 		uart_unlock_and_check_sysrq(port);
 		if (size)
 			tty_flip_buffer_push(tport);
+		ret = IRQ_HANDLED;
 	}
 
-	return IRQ_HANDLED;
+	return ret;
 }
 
 static void stm32_usart_set_mctrl(struct uart_port *port, unsigned int mctrl)
@@ -1072,6 +1080,7 @@ static int stm32_usart_startup(struct uart_port *port)
 		val |= USART_CR2_SWAP;
 		writel_relaxed(val, port->membase + ofs->cr2);
 	}
+	stm32_port->throttled = false;
 
 	/* RX FIFO Flush */
 	if (ofs->rqr != UNDEF_REG)