n_tty: Get read_cnt through accessor

Prepare for replacing read_cnt field with computed value.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 290769c67a8d2e9a611805796996a3cf5d281bbe..371612b42238c39e56c304c137291f90d5c37898 100644 (file)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -115,6 +115,11 @@ struct n_tty_data {
        raw_spinlock_t read_lock;
 };
 
+static inline size_t read_cnt(struct n_tty_data *ldata)
+{
+       return ldata->read_cnt;
+}
+
 static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
                               unsigned char __user *ptr)
 {
@@ -133,9 +138,9 @@ static int receive_room(struct tty_struct *tty)
                /* Multiply read_cnt by 3, since each byte might take up to
                 * three times as many spaces when PARMRK is set (depending on
                 * its flags, e.g. parity error). */
-               left = N_TTY_BUF_SIZE - ldata->read_cnt * 3 - 1;
+               left = N_TTY_BUF_SIZE - read_cnt(ldata) * 3 - 1;
        } else
-               left = N_TTY_BUF_SIZE - ldata->read_cnt - 1;
+               left = N_TTY_BUF_SIZE - read_cnt(ldata) - 1;
 
        /*
         * If we are doing input canonicalization, and there are no
@@ -180,7 +185,7 @@ static void n_tty_set_room(struct tty_struct *tty)
 
 static void put_tty_queue_nolock(unsigned char c, struct n_tty_data *ldata)
 {
-       if (ldata->read_cnt < N_TTY_BUF_SIZE) {
+       if (read_cnt(ldata) < N_TTY_BUF_SIZE) {
                ldata->read_buf[ldata->read_head] = c;
                ldata->read_head = (ldata->read_head + 1) & (N_TTY_BUF_SIZE-1);
                ldata->read_cnt++;
@@ -285,7 +290,7 @@ static ssize_t chars_in_buffer(struct tty_struct *tty)
 
        raw_spin_lock_irqsave(&ldata->read_lock, flags);
        if (!ldata->icanon) {
-               n = ldata->read_cnt;
+               n = read_cnt(ldata);
        } else if (ldata->canon_data) {
                n = (ldata->canon_head > ldata->read_tail) ?
                        ldata->canon_head - ldata->read_tail :
@@ -1204,7 +1209,7 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
        if (!test_bit(c, ldata->process_char_map) || ldata->lnext) {
                ldata->lnext = 0;
                parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
-               if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
+               if (read_cnt(ldata) >= (N_TTY_BUF_SIZE - parmrk - 1)) {
                        /* beep if no space */
                        if (L_ECHO(tty))
                                process_output('\a', tty);
@@ -1304,7 +1309,7 @@ send_signal:
                        return;
                }
                if (c == '\n') {
-                       if (ldata->read_cnt >= N_TTY_BUF_SIZE) {
+                       if (read_cnt(ldata) >= N_TTY_BUF_SIZE) {
                                if (L_ECHO(tty))
                                        process_output('\a', tty);
                                return;
@@ -1316,7 +1321,7 @@ send_signal:
                        goto handle_newline;
                }
                if (c == EOF_CHAR(tty)) {
-                       if (ldata->read_cnt >= N_TTY_BUF_SIZE)
+                       if (read_cnt(ldata) >= N_TTY_BUF_SIZE)
                                return;
                        if (ldata->canon_head != ldata->read_head)
                                set_bit(TTY_PUSH, &tty->flags);
@@ -1327,7 +1332,7 @@ send_signal:
                    (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) {
                        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
                                 ? 1 : 0;
-                       if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
+                       if (read_cnt(ldata) >= (N_TTY_BUF_SIZE - parmrk)) {
                                if (L_ECHO(tty))
                                        process_output('\a', tty);
                                return;
@@ -1364,7 +1369,7 @@ handle_newline:
        }
 
        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
-       if (ldata->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
+       if (read_cnt(ldata) >= (N_TTY_BUF_SIZE - parmrk - 1)) {
                /* beep if no space */
                if (L_ECHO(tty))
                        process_output('\a', tty);
@@ -1430,7 +1435,7 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
 
        if (ldata->real_raw) {
                raw_spin_lock_irqsave(&ldata->read_lock, cpuflags);
-               i = min(N_TTY_BUF_SIZE - ldata->read_cnt,
+               i = min(N_TTY_BUF_SIZE - read_cnt(ldata),
                        N_TTY_BUF_SIZE - ldata->read_head);
                i = min(count, i);
                memcpy(ldata->read_buf + ldata->read_head, cp, i);
@@ -1439,7 +1444,7 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
                cp += i;
                count -= i;
 
-               i = min(N_TTY_BUF_SIZE - ldata->read_cnt,
+               i = min(N_TTY_BUF_SIZE - read_cnt(ldata),
                        N_TTY_BUF_SIZE - ldata->read_head);
                i = min(count, i);
                memcpy(ldata->read_buf + ldata->read_head, cp, i);
@@ -1474,7 +1479,7 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
                        tty->ops->flush_chars(tty);
        }
 
-       if ((!ldata->icanon && (ldata->read_cnt >= ldata->minimum_to_wake)) ||
+       if ((!ldata->icanon && (read_cnt(ldata) >= ldata->minimum_to_wake)) ||
                L_EXTPROC(tty)) {
                kill_fasync(&tty->fasync, SIGIO, POLL_IN);
                if (waitqueue_active(&tty->read_wait))
@@ -1552,7 +1557,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
                ldata->erasing = 0;
        }
 
-       if (canon_change && !L_ICANON(tty) && ldata->read_cnt)
+       if (canon_change && !L_ICANON(tty) && read_cnt(ldata))
                wake_up_interruptible(&tty->read_wait);
 
        ldata->icanon = (L_ICANON(tty) != 0);
@@ -1701,7 +1706,7 @@ static inline int input_available_p(struct tty_struct *tty, int amt)
        if (ldata->icanon && !L_EXTPROC(tty)) {
                if (ldata->canon_data)
                        return 1;
-       } else if (ldata->read_cnt >= (amt ? amt : 1))
+       } else if (read_cnt(ldata) >= (amt ? amt : 1))
                return 1;
 
        return 0;
@@ -1737,7 +1742,7 @@ static int copy_from_read_buf(struct tty_struct *tty,
 
        retval = 0;
        raw_spin_lock_irqsave(&ldata->read_lock, flags);
-       n = min(ldata->read_cnt, N_TTY_BUF_SIZE - ldata->read_tail);
+       n = min(read_cnt(ldata), N_TTY_BUF_SIZE - ldata->read_tail);
        n = min(*nr, n);
        raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
        if (n) {
@@ -1751,7 +1756,7 @@ static int copy_from_read_buf(struct tty_struct *tty,
                ldata->read_tail = (ldata->read_tail + n) & (N_TTY_BUF_SIZE-1);
                ldata->read_cnt -= n;
                /* Turn single EOF into zero-length read */
-               if (L_EXTPROC(tty) && ldata->icanon && is_eof && !ldata->read_cnt)
+               if (L_EXTPROC(tty) && ldata->icanon && is_eof && !read_cnt(ldata))
                        n = 0;
                raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
                *b += n;
@@ -1787,7 +1792,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 
        raw_spin_lock_irqsave(&ldata->read_lock, flags);
 
-       n = min_t(size_t, *nr, ldata->read_cnt);
+       n = min(*nr, read_cnt(ldata));
        if (!n) {
                raw_spin_unlock_irqrestore(&ldata->read_lock, flags);
                return 0;
@@ -2253,7 +2258,7 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file,
                return put_user(tty_chars_in_buffer(tty), (int __user *) arg);
        case TIOCINQ:
                /* FIXME: Locking */
-               retval = ldata->read_cnt;
+               retval = read_cnt(ldata);
                if (L_ICANON(tty))
                        retval = inq_canon(ldata);
                return put_user(retval, (unsigned int __user *) arg);