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Subject[PATCH 2/7] tty: core: Add tty_debug() for printk(KERN_DEBUG) messages
Date
Introduce tty_debug() macro to output uniform debug information for
tty core debug messages (function name and tty name).

Note: printk(KERN_DEBUG) is retained here over pr_debug() since
messages can be enabled in non-DEBUG builds.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/tty_io.c | 41 +++++++++++++++++------------------------
include/linux/tty.h | 6 ++++++
2 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 2d9811a..6de2c36 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -524,8 +524,8 @@ static void __proc_set_tty(struct tty_struct *tty)
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
tty->session = get_pid(task_session(current));
if (current->signal->tty) {
- printk(KERN_DEBUG "%s: %s: current tty %s not NULL!!\n",
- __func__, tty->name, current->signal->tty->name);
+ tty_debug(tty, "current tty %s not NULL!!\n",
+ current->signal->tty->name);
tty_kref_put(current->signal->tty);
}
put_pid(current->signal->tty_old_pgrp);
@@ -768,7 +768,7 @@ static void do_tty_hangup(struct work_struct *work)
void tty_hangup(struct tty_struct *tty)
{
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s hangup...\n", tty_name(tty));
+ tty_debug(tty, "\n");
#endif
schedule_work(&tty->hangup_work);
}
@@ -787,7 +787,7 @@ EXPORT_SYMBOL(tty_hangup);
void tty_vhangup(struct tty_struct *tty)
{
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s vhangup...\n", tty_name(tty));
+ tty_debug(tty, "\n")
#endif
__tty_hangup(tty, 0);
}
@@ -826,7 +826,7 @@ void tty_vhangup_self(void)
static void tty_vhangup_session(struct tty_struct *tty)
{
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s vhangup session...\n", tty_name(tty));
+ tty_debug(tty, "\n");
#endif
__tty_hangup(tty, 1);
}
@@ -923,7 +923,7 @@ void disassociate_ctty(int on_exit)
tty_kref_put(tty);
} else {
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: no current tty\n", __func__);
+ tty_debug(tty, "no current tty\n");
#endif
}

@@ -1705,8 +1705,7 @@ static int tty_release_checks(struct tty_struct *tty, int idx)
{
#ifdef TTY_PARANOIA_CHECK
if (idx < 0 || idx >= tty->driver->num) {
- printk(KERN_DEBUG "%s: %s: bad idx %d\n",
- __func__, tty->name, idx);
+ tty_debug(tty, "bad idx %d\n", idx);
return -1;
}

@@ -1715,22 +1714,20 @@ static int tty_release_checks(struct tty_struct *tty, int idx)
return 0;

if (tty != tty->driver->ttys[idx]) {
- printk(KERN_DEBUG "%s: %s: bad driver table[%d] = %p\n",
- __func__, tty->name, idx, tty->driver->ttys[idx]);
+ tty_debug(tty, "bad driver table[%d] = %p\n",
+ idx, tty->driver->ttys[idx]);
return -1;
}
if (tty->driver->other) {
struct tty_struct *o_tty = tty->link;

if (o_tty != tty->driver->other->ttys[idx]) {
- printk(KERN_DEBUG "%s: %s: bad other table[%d] = %p\n",
- __func__, tty->name, idx,
- tty->driver->other->ttys[idx]);
+ tty_debug(tty, "bad other table[%d] = %p\n",
+ idx, tty->driver->other->ttys[idx]);
return -1;
}
if (o_tty->link != tty) {
- printk(KERN_DEBUG "%s: %s: bad link = %p\n",
- __func__, tty->name, o_tty->link);
+ tty_debug(tty, "bad link = %p\n", o_tty->link);
return -1;
}
}
@@ -1785,8 +1782,7 @@ int tty_release(struct inode *inode, struct file *filp)
}

#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: %s (tty count=%d)...\n", __func__,
- tty_name(tty), tty->count);
+ tty_debug(tty, "(tty count=%d)...\n", tty->count);
#endif

if (tty->ops->close)
@@ -1898,7 +1894,7 @@ int tty_release(struct inode *inode, struct file *filp)
return 0;

#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: %s: final close\n", __func__, tty_name(tty));
+ tty_debug(tty, "final close\n");
#endif
/*
* Ask the line discipline code to release its structures
@@ -1909,8 +1905,7 @@ int tty_release(struct inode *inode, struct file *filp)
tty_flush_works(tty);

#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: %s: freeing structure...\n", __func__,
- tty_name(tty));
+ tty_debug(tty, "freeing structure...\n");
#endif
/*
* The release_tty function takes care of the details of clearing
@@ -2101,8 +2096,7 @@ retry_open:
tty->driver->subtype == PTY_TYPE_MASTER)
noctty = 1;
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: %s: (tty count=%d)\n", __func__, tty->name,
- tty->count);
+ tty_debug(tty, "(tty count=%d)\n", tty->count);
#endif
if (tty->ops->open)
retval = tty->ops->open(tty, filp);
@@ -2112,8 +2106,7 @@ retry_open:

if (retval) {
#ifdef TTY_DEBUG_HANGUP
- printk(KERN_DEBUG "%s: %s: error %d, releasing...\n", __func__,
- tty->name, retval);
+ tty_debug(tty, "error %d, releasing...\n", retval);
#endif
tty_unlock(tty); /* need to call tty_release without BTM */
tty_release(inode, filp);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index ad6c891..d072ded 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -709,4 +709,10 @@ static inline void proc_tty_register_driver(struct tty_driver *d) {}
static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
#endif

+#define tty_debug(tty, f, args...) \
+ do { \
+ printk(KERN_DEBUG "%s: %s: " f, __func__, \
+ tty_name(tty), ##args); \
+ } while (0)
+
#endif
--
2.4.5


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