From 57c941212d203979720081198ebda41f51812635 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Thu, 18 Oct 2012 22:26:43 +0200 Subject: [PATCH] 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 Acked-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- 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 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 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) 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 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) 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 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) 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 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) 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 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) * 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 @@ 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); 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); -- GitLab