Commit 0bc1bd09 authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
Browse files

tty_port: drop last traces of low_latency 



The main purpose of tty_port::low_latency was removed in commit
a9c3f68f (tty: Fix low_latency BUG) back in 2014. It was left in
place for drivers as an optional tune knob. But only one driver has been
using it until the previous commit. So remove this misconcept
completely, given there are no users.

Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210105120239.28031-11-jslaby@suse.cz


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bb914668

Documentation/networking/caif/caif.rst

+0 −1
Original line number Diff line number Diff line
@@ -68,7 +68,6 @@ There are debugfs parameters provided for serial communication. 
* tty_status: Prints the bit-mask tty status information



  - 0x01 - tty->warned is on.

  - 0x02 - tty->low_latency is on.

  - 0x04 - tty->packed is on.

  - 0x08 - tty->flow_stopped is on.

  - 0x10 - tty->hw_stopped is on.

drivers/char/pcmcia/synclink_cs.c

+0 −2
Original line number Diff line number Diff line
@@ -2494,8 +2494,6 @@ static int mgslpc_open(struct tty_struct *tty, struct file * filp) 
		printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",

			 __FILE__, __LINE__, tty->driver->name, port->count);



	port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;



	spin_lock_irqsave(&info->netlock, flags);

	if (info->netcount) {

		retval = -EBUSY;

drivers/net/caif/caif_serial.c

+1 −2
Original line number Diff line number Diff line
@@ -89,8 +89,7 @@ static inline void update_tty_status(struct ser_device *ser) 
	ser->tty_status =

		ser->tty->stopped << 5 |

		ser->tty->flow_stopped << 3 |

		ser->tty->packet << 2 |

		ser->tty->port->low_latency << 1;

		ser->tty->packet << 2;

}

static inline void debugfs_init(struct ser_device *ser, struct tty_struct *tty)

{

drivers/s390/char/con3215.c

+0 −1
Original line number Diff line number Diff line
@@ -914,7 +914,6 @@ static int tty3215_open(struct tty_struct *tty, struct file * filp) 


	tty_port_tty_set(&raw->port, tty);



	raw->port.low_latency = 0; /* don't use bottom half for pushing chars */

	/*

	 * Start up 3215 device

	 */

drivers/s390/char/sclp_tty.c

+0 −1
Original line number Diff line number Diff line
@@ -65,7 +65,6 @@ sclp_tty_open(struct tty_struct *tty, struct file *filp) 
{

	tty_port_tty_set(&sclp_port, tty);

	tty->driver_data = NULL;

	sclp_port.low_latency = 0;

	return 0;

}