Merge tag 'tty-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are a few small TTY/Serial/vt fixes for 5.9-rc3

  Included in here are:
   - qcom serial fixes
   - vt ioctl and core bugfixes
   - pl011 serial driver fixes
   - 8250 serial driver fixes
   - other misc serial driver fixes

  and for good measure:
   - fbcon fix for syzbot found problem.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: serial: imx: add dependence and build for earlycon
  serial: samsung: Removes the IRQ not found warning
  serial: 8250: change lock order in serial8250_do_startup()
  serial: stm32: avoid kernel warning on absence of optional IRQ
  serial: pl011: Fix oops on -EPROBE_DEFER
  serial: pl011: Don't leak amba_ports entry on driver register error
  serial: 8250_exar: Fix number of ports for Commtech PCIe cards
  tty: serial: qcom_geni_serial: Drop __init from qcom_geni_console_setup
  serial: qcom_geni_serial: Fix recent kdb hang
  vt_ioctl: change VT_RESIZEX ioctl to check for error return from vc_resize()
  fbcon: prevent user font height or width change from causing potential out-of-bounds access
  vt: defer kfree() of vc_screenbuf in vc_do_resize()

10 files changed, 66 insertions, 23 deletions

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 04b9af7ed941..2d0e7c7e408d 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -744,6 +744,24 @@ static const struct exar8250_board pbn_exar_XR17V35x = {
 	.exit		= pci_xr17v35x_exit,
 };
 
+static const struct exar8250_board pbn_fastcom35x_2 = {
+	.num_ports	= 2,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_fastcom35x_4 = {
+	.num_ports	= 4,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_fastcom35x_8 = {
+	.num_ports	= 8,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
 static const struct exar8250_board pbn_exar_XR17V4358 = {
 	.num_ports	= 12,
 	.setup		= pci_xr17v35x_setup,
@@ -811,9 +829,9 @@ static const struct pci_device_id exar_pci_tbl[] = {
 	EXAR_DEVICE(EXAR, XR17V358, pbn_exar_XR17V35x),
 	EXAR_DEVICE(EXAR, XR17V4358, pbn_exar_XR17V4358),
 	EXAR_DEVICE(EXAR, XR17V8358, pbn_exar_XR17V8358),
-	EXAR_DEVICE(COMMTECH, 4222PCIE, pbn_exar_XR17V35x),
-	EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_exar_XR17V35x),
-	EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_exar_XR17V35x),
+	EXAR_DEVICE(COMMTECH, 4222PCIE, pbn_fastcom35x_2),
+	EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_fastcom35x_4),
+	EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_fastcom35x_8),
 
 	EXAR_DEVICE(COMMTECH, 4222PCI335, pbn_fastcom335_2),
 	EXAR_DEVICE(COMMTECH, 4224PCI335, pbn_fastcom335_4),
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 06028da9bc6a..c71d647eb87a 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2275,6 +2275,10 @@ int serial8250_do_startup(struct uart_port *port)
 
 	if (port->irq && !(up->port.flags & UPF_NO_THRE_TEST)) {
 		unsigned char iir1;
+
+		if (port->irqflags & IRQF_SHARED)
+			disable_irq_nosync(port->irq);
+
 		/*
 		 * Test for UARTs that do not reassert THRE when the
 		 * transmitter is idle and the interrupt has already
@@ -2284,8 +2288,6 @@ int serial8250_do_startup(struct uart_port *port)
 		 * allow register changes to become visible.
 		 */
 		spin_lock_irqsave(&port->lock, flags);
-		if (up->port.irqflags & IRQF_SHARED)
-			disable_irq_nosync(port->irq);
 
 		wait_for_xmitr(up, UART_LSR_THRE);
 		serial_port_out_sync(port, UART_IER, UART_IER_THRI);
@@ -2297,9 +2299,10 @@ int serial8250_do_startup(struct uart_port *port)
 		iir = serial_port_in(port, UART_IIR);
 		serial_port_out(port, UART_IER, 0);
 
+		spin_unlock_irqrestore(&port->lock, flags);
+
 		if (port->irqflags & IRQF_SHARED)
 			enable_irq(port->irq);
-		spin_unlock_irqrestore(&port->lock, flags);
 
 		/*
 		 * If the interrupt is not reasserted, or we otherwise
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 8a0352eb337c..9409be982aa6 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -517,6 +517,7 @@ config SERIAL_IMX_CONSOLE
 
 config SERIAL_IMX_EARLYCON
 	bool "Earlycon on IMX serial port"
+	depends on ARCH_MXC || COMPILE_TEST
 	depends on OF
 	select SERIAL_EARLYCON
 	help
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index d056ee6cca33..caf167f0c10a 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SERIAL_ZS) += zs.o
 obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
 obj-$(CONFIG_SERIAL_CPM) += cpm_uart/
 obj-$(CONFIG_SERIAL_IMX) += imx.o
+obj-$(CONFIG_SERIAL_IMX_EARLYCON) += imx_earlycon.o
 obj-$(CONFIG_SERIAL_MPC52xx) += mpc52xx_uart.o
 obj-$(CONFIG_SERIAL_ICOM) += icom.o
 obj-$(CONFIG_SERIAL_MESON) += meson_uart.o
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index c010f639298d..67498594d7d7 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2241,9 +2241,8 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
 	clk_disable(uap->clk);
 }
 
-static void __init
-pl011_console_get_options(struct uart_amba_port *uap, int *baud,
-			     int *parity, int *bits)
+static void pl011_console_get_options(struct uart_amba_port *uap, int *baud,
+				      int *parity, int *bits)
 {
 	if (pl011_read(uap, REG_CR) & UART01x_CR_UARTEN) {
 		unsigned int lcr_h, ibrd, fbrd;
@@ -2276,7 +2275,7 @@ pl011_console_get_options(struct uart_amba_port *uap, int *baud,
 	}
 }
 
-static int __init pl011_console_setup(struct console *co, char *options)
+static int pl011_console_setup(struct console *co, char *options)
 {
 	struct uart_amba_port *uap;
 	int baud = 38400;
@@ -2344,8 +2343,8 @@ static int __init pl011_console_setup(struct console *co, char *options)
  *
  *	Returns 0 if console matches; otherwise non-zero to use default matching
  */
-static int __init pl011_console_match(struct console *co, char *name, int idx,
-				      char *options)
+static int pl011_console_match(struct console *co, char *name, int idx,
+			       char *options)
 {
 	unsigned char iotype;
 	resource_size_t addr;
@@ -2615,7 +2614,7 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
 
 static int pl011_register_port(struct uart_amba_port *uap)
 {
-	int ret;
+	int ret, i;
 
 	/* Ensure interrupts from this UART are masked and cleared */
 	pl011_write(0, uap, REG_IMSC);
@@ -2626,6 +2625,9 @@ static int pl011_register_port(struct uart_amba_port *uap)
 		if (ret < 0) {
 			dev_err(uap->port.dev,
 				"Failed to register AMBA-PL011 driver\n");
+			for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
+				if (amba_ports[i] == uap)
+					amba_ports[i] = NULL;
 			return ret;
 		}
 	}
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 3aa29d201f54..184b458820a3 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -361,11 +361,16 @@ static int qcom_geni_serial_get_char(struct uart_port *uport)
 			return NO_POLL_CHAR;
 
 		if (word_cnt == 1 && (status & RX_LAST))
+			/*
+			 * NOTE: If RX_LAST_BYTE_VALID is 0 it needs to be
+			 * treated as if it was BYTES_PER_FIFO_WORD.
+			 */
 			private_data->poll_cached_bytes_cnt =
 				(status & RX_LAST_BYTE_VALID_MSK) >>
 				RX_LAST_BYTE_VALID_SHFT;
-		else
-			private_data->poll_cached_bytes_cnt = 4;
+
+		if (private_data->poll_cached_bytes_cnt == 0)
+			private_data->poll_cached_bytes_cnt = BYTES_PER_FIFO_WORD;
 
 		private_data->poll_cached_bytes =
 			readl(uport->membase + SE_GENI_RX_FIFOn);
@@ -1098,7 +1103,7 @@ static unsigned int qcom_geni_serial_tx_empty(struct uart_port *uport)
 }
 
 #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
-static int __init qcom_geni_console_setup(struct console *co, char *options)
+static int qcom_geni_console_setup(struct console *co, char *options)
 {
 	struct uart_port *uport;
 	struct qcom_geni_serial_port *port;
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 8ed3482d2e1e..8ae3e03fbd8c 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -1905,9 +1905,11 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 		ourport->tx_irq = ret + 1;
 	}
 
-	ret = platform_get_irq(platdev, 1);
-	if (ret > 0)
-		ourport->tx_irq = ret;
+	if (!s3c24xx_serial_has_interrupt_mask(port)) {
+		ret = platform_get_irq(platdev, 1);
+		if (ret > 0)
+			ourport->tx_irq = ret;
+	}
 	/*
 	 * DMA is currently supported only on DT platforms, if DMA properties
 	 * are specified.
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 143300a80090..ba503dd04ce2 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -970,7 +970,7 @@ static int stm32_init_port(struct stm32_port *stm32port,
 		return ret;
 
 	if (stm32port->info->cfg.has_wakeup) {
-		stm32port->wakeirq = platform_get_irq(pdev, 1);
+		stm32port->wakeirq = platform_get_irq_optional(pdev, 1);
 		if (stm32port->wakeirq <= 0 && stm32port->wakeirq != -ENXIO)
 			return stm32port->wakeirq ? : -ENODEV;
 	}
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index d8b9363b81c1..19cd4a4b1939 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1201,7 +1201,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 	unsigned int old_rows, old_row_size, first_copied_row;
 	unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 	unsigned int user;
-	unsigned short *newscreen;
+	unsigned short *oldscreen, *newscreen;
 	struct uni_screen *new_uniscr = NULL;
 
 	WARN_CONSOLE_UNLOCKED();
@@ -1299,10 +1299,11 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 	if (new_scr_end > new_origin)
 		scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 			    new_scr_end - new_origin);
-	kfree(vc->vc_screenbuf);
+	oldscreen = vc->vc_screenbuf;
 	vc->vc_screenbuf = newscreen;
 	vc->vc_screenbuf_size = new_screen_size;
 	set_origin(vc);
+	kfree(oldscreen);
 
 	/* do part of a reset_terminal() */
 	vc->vc_top = 0;
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 91c301775047..a4e520bdd521 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -806,12 +806,22 @@ static int vt_resizex(struct vc_data *vc, struct vt_consize __user *cs)
 		console_lock();
 		vcp = vc_cons[i].d;
 		if (vcp) {
+			int ret;
+			int save_scan_lines = vcp->vc_scan_lines;
+			int save_font_height = vcp->vc_font.height;
+
 			if (v.v_vlin)
 				vcp->vc_scan_lines = v.v_vlin;
 			if (v.v_clin)
 				vcp->vc_font.height = v.v_clin;
 			vcp->vc_resize_user = 1;
-			vc_resize(vcp, v.v_cols, v.v_rows);
+			ret = vc_resize(vcp, v.v_cols, v.v_rows);
+			if (ret) {
+				vcp->vc_scan_lines = save_scan_lines;
+				vcp->vc_font.height = save_font_height;
+				console_unlock();
+				return ret;
+			}
 		}
 		console_unlock();
 	}