diff options
| -rw-r--r-- | drivers/tty/n_tty.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 4a34a9f43b29..3a1a79462d16 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1955,19 +1955,17 @@ static inline int input_available_p(struct tty_struct *tty, int poll) * read_tail published */ -static int copy_from_read_buf(struct tty_struct *tty, +static void copy_from_read_buf(struct tty_struct *tty, unsigned char **kbp, size_t *nr) { struct n_tty_data *ldata = tty->disc_data; - int retval; size_t n; bool is_eof; size_t head = smp_load_acquire(&ldata->commit_head); size_t tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1); - retval = 0; n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail); n = min(*nr, n); if (n) { @@ -1984,7 +1982,6 @@ static int copy_from_read_buf(struct tty_struct *tty, *kbp += n; *nr -= n; } - return retval; } /** @@ -2010,9 +2007,9 @@ static int copy_from_read_buf(struct tty_struct *tty, * read_tail published */ -static int canon_copy_from_read_buf(struct tty_struct *tty, - unsigned char **kbp, - size_t *nr) +static void canon_copy_from_read_buf(struct tty_struct *tty, + unsigned char **kbp, + size_t *nr) { struct n_tty_data *ldata = tty->disc_data; size_t n, size, more, c; @@ -2022,7 +2019,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty, /* N.B. avoid overrun if nr == 0 */ if (!*nr) - return 0; + return; n = min(*nr + 1, smp_load_acquire(&ldata->canon_head) - ldata->read_tail); @@ -2069,7 +2066,6 @@ static int canon_copy_from_read_buf(struct tty_struct *tty, ldata->push = 0; tty_audit_push(); } - return 0; } extern ssize_t redirected_tty_write(struct file *, const char __user *, @@ -2222,24 +2218,17 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, } if (ldata->icanon && !L_EXTPROC(tty)) { - retval = canon_copy_from_read_buf(tty, &kb, &nr); - if (retval) - break; + canon_copy_from_read_buf(tty, &kb, &nr); } else { - int uncopied; - /* Deal with packet mode. */ if (packet && kb == kbuf) { *kb++ = TIOCPKT_DATA; nr--; } - uncopied = copy_from_read_buf(tty, &kb, &nr); - uncopied += copy_from_read_buf(tty, &kb, &nr); - if (uncopied) { - retval = -EFAULT; - break; - } + /* See comment above copy_from_read_buf() why twice */ + copy_from_read_buf(tty, &kb, &nr); + copy_from_read_buf(tty, &kb, &nr); } n_tty_check_unthrottle(tty); |