[PATCH 17/21] TTY: n_tty, propagate n_tty_data

From: Jiri Slaby
Date: Thu Oct 18 2012 - 16:27:03 EST

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In some funtions we need only n_tty_data, so pass it down directly in
case tty is not needed there.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/tty/n_tty.c | 171 ++++++++++++++++++++++++----------------------------
1 file changed, 78 insertions(+), 93 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 0a6fcda..531e539 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -153,10 +153,8 @@ static void n_tty_set_room(struct tty_struct *tty)
schedule_work(&tty->buf.work);
}

-static void put_tty_queue_nolock(unsigned char c, struct tty_struct *tty)
+static void put_tty_queue_nolock(unsigned char c, struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
-
if (ldata->read_cnt < N_TTY_BUF_SIZE) {
ldata->read_buf[ldata->read_head] = c;
ldata->read_head = (ldata->read_head + 1) & (N_TTY_BUF_SIZE-1);
@@ -167,23 +165,22 @@ static void put_tty_queue_nolock(unsigned char c, struct tty_struct *tty)
/**
* put_tty_queue - add character to tty
* @c: character
- * @tty: tty device
+ * @ldata: n_tty data
*
* Add a character to the tty read_buf queue. This is done under the
* read_lock to serialize character addition and also to protect us
* against parallel reads or flushes
*/

-static void put_tty_queue(unsigned char c, struct tty_struct *tty)
+static void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
unsigned long flags;
/*
* The problem of stomping on the buffers ends here.
* Why didn't anyone see this one coming? --AJK
*/
spin_lock_irqsave(&ldata->read_lock, flags);
- put_tty_queue_nolock(c, tty);
+ put_tty_queue_nolock(c, ldata);
spin_unlock_irqrestore(&ldata->read_lock, flags);
}

@@ -699,16 +696,15 @@ static void process_echoes(struct tty_struct *tty)
/**
* add_echo_byte - add a byte to the echo buffer
* @c: unicode byte to echo
- * @tty: terminal device
+ * @ldata: n_tty data
*
* Add a character or operation byte to the echo buffer.
*
* Should be called under the echo lock to protect the echo buffer.
*/

-static void add_echo_byte(unsigned char c, struct tty_struct *tty)
+static void add_echo_byte(unsigned char c, struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
int new_byte_pos;

if (ldata->echo_cnt == N_TTY_BUF_SIZE) {
@@ -746,28 +742,24 @@ static void add_echo_byte(unsigned char c, struct tty_struct *tty)

/**
* echo_move_back_col - add operation to move back a column
- * @tty: terminal device
+ * @ldata: n_tty data
*
* Add an operation to the echo buffer to move back one column.
*
* Locking: echo_lock to protect the echo buffer
*/

-static void echo_move_back_col(struct tty_struct *tty)
+static void echo_move_back_col(struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
-
mutex_lock(&ldata->echo_lock);
-
- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(ECHO_OP_MOVE_BACK_COL, tty);
-
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(ECHO_OP_MOVE_BACK_COL, ldata);
mutex_unlock(&ldata->echo_lock);
}

/**
* echo_set_canon_col - add operation to set the canon column
- * @tty: terminal device
+ * @ldata: n_tty data
*
* Add an operation to the echo buffer to set the canon column
* to the current column.
@@ -775,15 +767,11 @@ static void echo_move_back_col(struct tty_struct *tty)
* Locking: echo_lock to protect the echo buffer
*/

-static void echo_set_canon_col(struct tty_struct *tty)
+static void echo_set_canon_col(struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
-
mutex_lock(&ldata->echo_lock);
-
- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(ECHO_OP_SET_CANON_COL, tty);
-
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(ECHO_OP_SET_CANON_COL, ldata);
mutex_unlock(&ldata->echo_lock);
}

@@ -791,7 +779,7 @@ static void echo_set_canon_col(struct tty_struct *tty)
* echo_erase_tab - add operation to erase a tab
* @num_chars: number of character columns already used
* @after_tab: true if num_chars starts after a previous tab
- * @tty: terminal device
+ * @ldata: n_tty data
*
* Add an operation to the echo buffer to erase a tab.
*
@@ -805,14 +793,12 @@ static void echo_set_canon_col(struct tty_struct *tty)
*/

static void echo_erase_tab(unsigned int num_chars, int after_tab,
- struct tty_struct *tty)
+ struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
-
mutex_lock(&ldata->echo_lock);

- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(ECHO_OP_ERASE_TAB, tty);
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(ECHO_OP_ERASE_TAB, ldata);

/* We only need to know this modulo 8 (tab spacing) */
num_chars &= 7;
@@ -821,7 +807,7 @@ static void echo_erase_tab(unsigned int num_chars, int after_tab,
if (after_tab)
num_chars |= 0x80;

- add_echo_byte(num_chars, tty);
+ add_echo_byte(num_chars, ldata);

mutex_unlock(&ldata->echo_lock);
}
@@ -839,19 +825,15 @@ static void echo_erase_tab(unsigned int num_chars, int after_tab,
* Locking: echo_lock to protect the echo buffer
*/

-static void echo_char_raw(unsigned char c, struct tty_struct *tty)
+static void echo_char_raw(unsigned char c, struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
-
mutex_lock(&ldata->echo_lock);
-
if (c == ECHO_OP_START) {
- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(ECHO_OP_START, tty);
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(ECHO_OP_START, ldata);
} else {
- add_echo_byte(c, tty);
+ add_echo_byte(c, ldata);
}
-
mutex_unlock(&ldata->echo_lock);
}

@@ -876,12 +858,12 @@ static void echo_char(unsigned char c, struct tty_struct *tty)
mutex_lock(&ldata->echo_lock);

if (c == ECHO_OP_START) {
- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(ECHO_OP_START, tty);
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(ECHO_OP_START, ldata);
} else {
if (L_ECHOCTL(tty) && iscntrl(c) && c != '\t')
- add_echo_byte(ECHO_OP_START, tty);
- add_echo_byte(c, tty);
+ add_echo_byte(ECHO_OP_START, ldata);
+ add_echo_byte(c, ldata);
}

mutex_unlock(&ldata->echo_lock);
@@ -889,14 +871,13 @@ static void echo_char(unsigned char c, struct tty_struct *tty)

/**
* finish_erasing - complete erase
- * @tty: tty doing the erase
+ * @ldata: n_tty data
*/

-static inline void finish_erasing(struct tty_struct *tty)
+static inline void finish_erasing(struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
if (ldata->erasing) {
- echo_char_raw('/', tty);
+ echo_char_raw('/', ldata);
ldata->erasing = 0;
}
}
@@ -944,11 +925,11 @@ static void eraser(unsigned char c, struct tty_struct *tty)
(N_TTY_BUF_SIZE - 1));
ldata->read_head = ldata->canon_head;
spin_unlock_irqrestore(&ldata->read_lock, flags);
- finish_erasing(tty);
+ finish_erasing(ldata);
echo_char(KILL_CHAR(tty), tty);
/* Add a newline if ECHOK is on and ECHOKE is off. */
if (L_ECHOK(tty))
- echo_char_raw('\n', tty);
+ echo_char_raw('\n', ldata);
return;
}
kill_type = KILL;
@@ -984,15 +965,16 @@ static void eraser(unsigned char c, struct tty_struct *tty)
if (L_ECHO(tty)) {
if (L_ECHOPRT(tty)) {
if (!ldata->erasing) {
- echo_char_raw('\\', tty);
+ echo_char_raw('\\', ldata);
ldata->erasing = 1;
}
/* if cnt > 1, output a multi-byte character */
echo_char(c, tty);
while (--cnt > 0) {
head = (head+1) & (N_TTY_BUF_SIZE-1);
- echo_char_raw(ldata->read_buf[head], tty);
- echo_move_back_col(tty);
+ echo_char_raw(ldata->read_buf[head],
+ ldata);
+ echo_move_back_col(ldata);
}
} else if (kill_type == ERASE && !L_ECHOE(tty)) {
echo_char(ERASE_CHAR(tty), tty);
@@ -1021,17 +1003,17 @@ static void eraser(unsigned char c, struct tty_struct *tty)
num_chars++;
}
}
- echo_erase_tab(num_chars, after_tab, tty);
+ echo_erase_tab(num_chars, after_tab, ldata);
} else {
if (iscntrl(c) && L_ECHOCTL(tty)) {
- echo_char_raw('\b', tty);
- echo_char_raw(' ', tty);
- echo_char_raw('\b', tty);
+ echo_char_raw('\b', ldata);
+ echo_char_raw(' ', ldata);
+ echo_char_raw('\b', ldata);
}
if (!iscntrl(c) || L_ECHOCTL(tty)) {
- echo_char_raw('\b', tty);
- echo_char_raw(' ', tty);
- echo_char_raw('\b', tty);
+ echo_char_raw('\b', ldata);
+ echo_char_raw(' ', ldata);
+ echo_char_raw('\b', ldata);
}
}
}
@@ -1039,7 +1021,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
break;
}
if (ldata->read_head == ldata->canon_head && L_ECHO(tty))
- finish_erasing(tty);
+ finish_erasing(ldata);
}

/**
@@ -1078,6 +1060,8 @@ static inline void isig(int sig, struct tty_struct *tty, int flush)

static inline void n_tty_receive_break(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
+
if (I_IGNBRK(tty))
return;
if (I_BRKINT(tty)) {
@@ -1085,10 +1069,10 @@ static inline void n_tty_receive_break(struct tty_struct *tty)
return;
}
if (I_PARMRK(tty)) {
- put_tty_queue('\377', tty);
- put_tty_queue('\0', tty);
+ put_tty_queue('\377', ldata);
+ put_tty_queue('\0', ldata);
}
- put_tty_queue('\0', tty);
+ put_tty_queue('\0', ldata);
wake_up_interruptible(&tty->read_wait);
}

@@ -1132,16 +1116,18 @@ static inline void n_tty_receive_overrun(struct tty_struct *tty)
static inline void n_tty_receive_parity_error(struct tty_struct *tty,
unsigned char c)
{
+ struct n_tty_data *ldata = tty->disc_data;
+
if (I_IGNPAR(tty))
return;
if (I_PARMRK(tty)) {
- put_tty_queue('\377', tty);
- put_tty_queue('\0', tty);
- put_tty_queue(c, tty);
+ put_tty_queue('\377', ldata);
+ put_tty_queue('\0', ldata);
+ put_tty_queue(c, ldata);
} else if (I_INPCK(tty))
- put_tty_queue('\0', tty);
+ put_tty_queue('\0', ldata);
else
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);
wake_up_interruptible(&tty->read_wait);
}

@@ -1162,7 +1148,7 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
int parmrk;

if (ldata->raw) {
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);
return;
}

@@ -1172,7 +1158,7 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
c = tolower(c);

if (L_EXTPROC(tty)) {
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);
return;
}

@@ -1210,16 +1196,16 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
return;
}
if (L_ECHO(tty)) {
- finish_erasing(tty);
+ finish_erasing(ldata);
/* Record the column of first canon char. */
if (ldata->canon_head == ldata->read_head)
- echo_set_canon_col(tty);
+ echo_set_canon_col(ldata);
echo_char(c, tty);
process_echoes(tty);
}
if (parmrk)
- put_tty_queue(c, tty);
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);
+ put_tty_queue(c, ldata);
return;
}

@@ -1285,10 +1271,10 @@ send_signal:
if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
ldata->lnext = 1;
if (L_ECHO(tty)) {
- finish_erasing(tty);
+ finish_erasing(ldata);
if (L_ECHOCTL(tty)) {
- echo_char_raw('^', tty);
- echo_char_raw('\b', tty);
+ echo_char_raw('^', ldata);
+ echo_char_raw('\b', ldata);
process_echoes(tty);
}
}
@@ -1298,9 +1284,9 @@ send_signal:
L_IEXTEN(tty)) {
unsigned long tail = ldata->canon_head;

- finish_erasing(tty);
+ finish_erasing(ldata);
echo_char(c, tty);
- echo_char_raw('\n', tty);
+ echo_char_raw('\n', ldata);
while (tail != ldata->read_head) {
echo_char(ldata->read_buf[tail], tty);
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
@@ -1315,7 +1301,7 @@ send_signal:
return;
}
if (L_ECHO(tty) || L_ECHONL(tty)) {
- echo_char_raw('\n', tty);
+ echo_char_raw('\n', ldata);
process_echoes(tty);
}
goto handle_newline;
@@ -1343,7 +1329,7 @@ send_signal:
if (L_ECHO(tty)) {
/* Record the column of first canon char. */
if (ldata->canon_head == ldata->read_head)
- echo_set_canon_col(tty);
+ echo_set_canon_col(ldata);
echo_char(c, tty);
process_echoes(tty);
}
@@ -1352,12 +1338,12 @@ send_signal:
* EOL_CHAR and EOL2_CHAR?
*/
if (parmrk)
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);

handle_newline:
spin_lock_irqsave(&ldata->read_lock, flags);
set_bit(ldata->read_head, ldata->read_flags);
- put_tty_queue_nolock(c, tty);
+ put_tty_queue_nolock(c, ldata);
ldata->canon_head = ldata->read_head;
ldata->canon_data++;
spin_unlock_irqrestore(&ldata->read_lock, flags);
@@ -1376,22 +1362,22 @@ handle_newline:
return;
}
if (L_ECHO(tty)) {
- finish_erasing(tty);
+ finish_erasing(ldata);
if (c == '\n')
- echo_char_raw('\n', tty);
+ echo_char_raw('\n', ldata);
else {
/* Record the column of first canon char. */
if (ldata->canon_head == ldata->read_head)
- echo_set_canon_col(tty);
+ echo_set_canon_col(ldata);
echo_char(c, tty);
}
process_echoes(tty);
}

if (parmrk)
- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);

- put_tty_queue(c, tty);
+ put_tty_queue(c, ldata);
}

@@ -2140,9 +2126,8 @@ static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
return mask;
}

-static unsigned long inq_canon(struct tty_struct *tty)
+static unsigned long inq_canon(struct n_tty_data *ldata)
{
- struct n_tty_data *ldata = tty->disc_data;
int nr, head, tail;

if (!ldata->canon_data)
@@ -2173,7 +2158,7 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file,
/* FIXME: Locking */
retval = ldata->read_cnt;
if (L_ICANON(tty))
- retval = inq_canon(tty);
+ retval = inq_canon(ldata);
return put_user(retval, (unsigned int __user *) arg);
default:
return n_tty_ioctl_helper(tty, file, cmd, arg);
--
1.7.12.3

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Next message: Jiri Slaby: "[PATCH 21/21] TTY: move tty buffers to tty_port"
Previous message: Jiri Slaby: "[PATCH 05/21] TTY: move devpts kill to pty"
In reply to: Jiri Slaby: "[PATCH 05/21] TTY: move devpts kill to pty"
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Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]