Commit 84dda296 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'tty-4.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 

Pull tty/serial driver fixes from Greg KH:
 "Here are some small serdev and serial fixes for 4.15-rc3. They resolve
  some reported problems:

   - a number of serdev fixes to resolve crashes

   - MIPS build fixes for their serial port

   - a new 8250 device id

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

* tag 'tty-4.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  MIPS: Add custom serial.h with BASE_BAUD override for generic kernel
  serdev: ttyport: fix tty locking in close
  serdev: ttyport: fix NULL-deref on hangup
  serdev: fix receive_buf return value when no callback
  serdev: ttyport: add missing receive_buf sanity checks
  serial: 8250_early: Only set divisor if valid clk & baud
  serial: 8250_pci: Add Amazon PCI serial device ID
parents 6b0b3bda c8ec2041

arch/mips/include/asm/Kbuild

+0 −1
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ generic-y += qrwlock.h 
generic-y += qspinlock.h

generic-y += sections.h

generic-y += segment.h

generic-y += serial.h

generic-y += trace_clock.h

generic-y += unaligned.h

generic-y += user.h

arch/mips/include/asm/serial.h

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 MIPS Tech, LLC

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 */

#ifndef __ASM__SERIAL_H

#define __ASM__SERIAL_H



#ifdef CONFIG_MIPS_GENERIC

/*

 * Generic kernels cannot know a correct value for all platforms at

 * compile time. Set it to 0 to prevent 8250_early using it

 */

#define BASE_BAUD 0

#else

#include <asm-generic/serial.h>

#endif



#endif /* __ASM__SERIAL_H */

drivers/tty/serdev/serdev-ttyport.c

+23 −3
Original line number Diff line number Diff line
@@ -27,23 +27,41 @@ static int ttyport_receive_buf(struct tty_port *port, const unsigned char *cp, 
{

	struct serdev_controller *ctrl = port->client_data;

	struct serport *serport = serdev_controller_get_drvdata(ctrl);

	int ret;



	if (!test_bit(SERPORT_ACTIVE, &serport->flags))

		return 0;



	return serdev_controller_receive_buf(ctrl, cp, count);

	ret = serdev_controller_receive_buf(ctrl, cp, count);



	dev_WARN_ONCE(&ctrl->dev, ret < 0 || ret > count,

				"receive_buf returns %d (count = %zu)\n",

				ret, count);

	if (ret < 0)

		return 0;

	else if (ret > count)

		return count;



	return ret;

}



static void ttyport_write_wakeup(struct tty_port *port)

{

	struct serdev_controller *ctrl = port->client_data;

	struct serport *serport = serdev_controller_get_drvdata(ctrl);

	struct tty_struct *tty;



	tty = tty_port_tty_get(port);

	if (!tty)

		return;



	if (test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags) &&

	if (test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&

	    test_bit(SERPORT_ACTIVE, &serport->flags))

		serdev_controller_write_wakeup(ctrl);



	wake_up_interruptible_poll(&port->tty->write_wait, POLLOUT);

	wake_up_interruptible_poll(&tty->write_wait, POLLOUT);



	tty_kref_put(tty);

}



static const struct tty_port_client_operations client_ops = {
@@ -136,8 +154,10 @@ static void ttyport_close(struct serdev_controller *ctrl) 


	clear_bit(SERPORT_ACTIVE, &serport->flags);



	tty_lock(tty);

	if (tty->ops->close)

		tty->ops->close(tty, NULL);

	tty_unlock(tty);



	tty_release_struct(tty, serport->tty_idx);

}

drivers/tty/serial/8250/8250_early.c

+8 −6
Original line number Diff line number Diff line
@@ -122,6 +122,7 @@ static void __init init_port(struct earlycon_device *device) 
	serial8250_early_out(port, UART_FCR, 0);	/* no fifo */

	serial8250_early_out(port, UART_MCR, 0x3);	/* DTR + RTS */



	if (port->uartclk && device->baud) {

		divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * device->baud);

		c = serial8250_early_in(port, UART_LCR);

		serial8250_early_out(port, UART_LCR, c | UART_LCR_DLAB);
@@ -129,6 +130,7 @@ static void __init init_port(struct earlycon_device *device) 
		serial8250_early_out(port, UART_DLM, (divisor >> 8) & 0xff);

		serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);

	}

}



int __init early_serial8250_setup(struct earlycon_device *device,

					 const char *options)

drivers/tty/serial/8250/8250_pci.c

+3 −0
Original line number Diff line number Diff line
@@ -5135,6 +5135,9 @@ static const struct pci_device_id serial_pci_tbl[] = { 
	{ PCI_DEVICE(0x1601, 0x0800), .driver_data = pbn_b0_4_1250000 },

	{ PCI_DEVICE(0x1601, 0xa801), .driver_data = pbn_b0_4_1250000 },



	/* Amazon PCI serial device */

	{ PCI_DEVICE(0x1d0f, 0x8250), .driver_data = pbn_b0_1_115200 },



	/*

	 * These entries match devices with class COMMUNICATION_SERIAL,

	 * COMMUNICATION_MODEM or COMMUNICATION_MULTISERIAL

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