diff options
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index cbe98bc2b998..b279f8730e04 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -124,6 +124,8 @@ struct n_tty_data { struct mutex output_lock; }; +#define MASK(x) ((x) & (N_TTY_BUF_SIZE - 1)) + static inline size_t read_cnt(struct n_tty_data *ldata) { return ldata->read_head - ldata->read_tail; @@ -978,14 +980,15 @@ static void eraser(unsigned char c, struct tty_struct *tty) } seen_alnums = 0; - while (ldata->read_head != ldata->canon_head) { + while (MASK(ldata->read_head) != MASK(ldata->canon_head)) { head = ldata->read_head; /* erase a single possibly multibyte character */ do { head--; c = read_buf(ldata, head); - } while (is_continuation(c, tty) && head != ldata->canon_head); + } while (is_continuation(c, tty) && + MASK(head) != MASK(ldata->canon_head)); /* do not partially erase */ if (is_continuation(c, tty)) @@ -1027,7 +1030,7 @@ static void eraser(unsigned char c, struct tty_struct *tty) * This info is used to go back the correct * number of columns. */ - while (tail != ldata->canon_head) { + while (MASK(tail) != MASK(ldata->canon_head)) { tail--; c = read_buf(ldata, tail); if (c == '\t') { @@ -1302,7 +1305,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c) finish_erasing(ldata); echo_char(c, tty); echo_char_raw('\n', ldata); - while (tail != ldata->read_head) { + while (MASK(tail) != MASK(ldata->read_head)) { echo_char(read_buf(ldata, tail), tty); tail++; } @@ -2411,7 +2414,7 @@ static unsigned long inq_canon(struct n_tty_data *ldata) tail = ldata->read_tail; nr = head - tail; /* Skip EOF-chars.. */ - while (head != tail) { + while (MASK(head) != MASK(tail)) { if (test_bit(tail & (N_TTY_BUF_SIZE - 1), ldata->read_flags) && read_buf(ldata, tail) == __DISABLED_CHAR) nr--; |