TTY: n_tty, propagate n_tty_data

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@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 78 insertions, 93 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 0a6fcda96152..531e539dbfcf 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);