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pps: Move timestamp read into PPS code proper 

The PPS (Pulse-Per-Second) line discipline has developed a number of
unhealthy attachments to core tty data and functions, ultimately leading
to its breakage.

The previous patches fixed the crashing.  This one reduces coupling further
by eliminating the timestamp parameter from the dcd_change ldisc method.
This reduces header file linkage and makes the extension more generic,
and the timestamp read is delayed only slightly, from just before the
ldisc->ops->dcd_change method call to just after.

Fix attendant build breakage in
    drivers/tty/n_tty.c
    drivers/tty/tty_buffer.c
    drivers/staging/speakup/selection.c
    drivers/staging/dgrp/dgrp_*.c

Cc: William Hubbs <w.d.hubbs@gmail.com>
Cc: Chris Brannon <chris@the-brannons.com>
Cc: Kirk Reiser <kirk@braille.uwo.ca>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: George Spelvin <linux@horizon.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
George Spelvin 2013-02-12 02:00:43 -05:00 committed by Greg Kroah-Hartman
parent ce3da1a654
commit 593fb1ae45
9 changed files with 18 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/pps/clients/pps-ldisc.c
View File

@ -29,11 +29,14 @@
#define PPS_TTY_MAGIC 0x0001
static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status,
struct pps_event_time *ts)
static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status)
{
struct pps_device *pps = pps_lookup_dev(tty);
struct pps_device *pps;
struct pps_event_time ts;
pps_get_ts(&ts);
pps = pps_lookup_dev(tty);
/*
* This should never fail, but the ldisc locking is very
* convoluted, so don't crash just in case.
@ -42,7 +45,7 @@ static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status,
return;
/* Now do the PPS event report */
pps_event(pps, ts, status ? PPS_CAPTUREASSERT :
pps_event(pps, &ts, status ? PPS_CAPTUREASSERT :
PPS_CAPTURECLEAR, NULL);
dev_dbg(pps->dev, "PPS %s at %lu\n",

1
drivers/staging/dgrp/dgrp_net_ops.c
View File

@ -37,6 +37,7 @@
#include <linux/proc_fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/spinlock.h>

1
drivers/staging/dgrp/dgrp_tty.c
View File

@ -39,6 +39,7 @@
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/uaccess.h>

1
drivers/staging/speakup/selection.c
View File

@ -2,6 +2,7 @@
#include <linux/consolemap.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/device.h> /* for dev_warn */
#include <linux/selection.h>
#include "speakup.h"

3
drivers/tty/n_tty.c
View File

@ -49,6 +49,7 @@
#include <linux/file.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
/* number of characters left in xmit buffer before select has we have room */
@ -2188,7 +2189,7 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
* n_tty_inherit_ops - inherit N_TTY methods
* @ops: struct tty_ldisc_ops where to save N_TTY methods
*
* Used by a generic struct tty_ldisc_ops to easily inherit N_TTY
* Enables a 'subclass' line discipline to 'inherit' N_TTY
* methods.
*/

5
drivers/tty/serial/serial_core.c
View File

@ -2726,13 +2726,12 @@ void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
struct uart_state *state = uport->state;
struct tty_port *port = &state->port;
struct tty_ldisc *ld = NULL;
struct pps_event_time ts;
struct tty_struct *tty = port->tty;
if (tty)
ld = tty_ldisc_ref(tty);
if (ld && ld->ops->dcd_change)
pps_get_ts(&ts);
ld->ops->dcd_change(tty, status);
uport->icount.dcd++;
#ifdef CONFIG_HARD_PPS
@ -2747,8 +2746,6 @@ void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
tty_hangup(tty);
}
if (ld && ld->ops->dcd_change)
ld->ops->dcd_change(tty, status, &ts);
if (ld)
tty_ldisc_deref(ld);
}

1
drivers/tty/tty_buffer.c
View File

@ -16,6 +16,7 @@
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
/**
* tty_buffer_free_all - free buffers used by a tty

1
include/linux/serial_core.h
View File

@ -29,7 +29,6 @@
#include <linux/tty.h>
#include <linux/mutex.h>
#include <linux/sysrq.h>
#include <linux/pps_kernel.h>
#include <uapi/linux/serial_core.h>
struct uart_port;

11
include/linux/tty_ldisc.h
View File

@ -100,16 +100,14 @@
* seek to perform this action quickly but should wait until
* any pending driver I/O is completed.
*
* void (*dcd_change)(struct tty_struct *tty, unsigned int status,
* struct pps_event_time *ts)
* void (*dcd_change)(struct tty_struct *tty, unsigned int status)
*
* Tells the discipline that the DCD pin has changed its status and
* the relative timestamp. Pointer ts cannot be NULL.
* Tells the discipline that the DCD pin has changed its status.
* Used exclusively by the N_PPS (Pulse-Per-Second) line discipline.
*/
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/pps_kernel.h>
#include <linux/wait.h>
struct tty_ldisc_ops {
@ -144,8 +142,7 @@ struct tty_ldisc_ops {
void (*receive_buf)(struct tty_struct *, const unsigned char *cp,
char *fp, int count);
void (*write_wakeup)(struct tty_struct *);
void (*dcd_change)(struct tty_struct *, unsigned int,
struct pps_event_time *);
void (*dcd_change)(struct tty_struct *, unsigned int);
struct module *owner;