diff options
Diffstat (limited to 'drivers/tty/tty_buffer.c')
| -rw-r--r-- | drivers/tty/tty_buffer.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index a42a028a9d4e..6c7a1d043c76 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -403,6 +403,18 @@ int tty_prepare_flip_string_flags(struct tty_port *port, EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags); +static int +receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count) +{ + struct tty_ldisc *disc = tty->ldisc; + + count = min_t(int, count, tty->receive_room); + if (count) + disc->ops->receive_buf(tty, head->char_buf_ptr + head->read, + head->flag_buf_ptr + head->read, count); + head->read += count; + return count; +} /** * flush_to_ldisc @@ -438,8 +450,6 @@ static void flush_to_ldisc(struct work_struct *work) struct tty_buffer *head; while ((head = buf->head) != NULL) { int count; - char *char_buf; - unsigned char *flag_buf; count = head->commit - head->read; if (!count) { @@ -449,16 +459,10 @@ static void flush_to_ldisc(struct work_struct *work) tty_buffer_free(port, head); continue; } - if (!tty->receive_room) - break; - if (count > tty->receive_room) - count = tty->receive_room; - char_buf = head->char_buf_ptr + head->read; - flag_buf = head->flag_buf_ptr + head->read; - head->read += count; spin_unlock_irqrestore(&buf->lock, flags); - disc->ops->receive_buf(tty, char_buf, - flag_buf, count); + + count = receive_buf(tty, head, count); + spin_lock_irqsave(&buf->lock, flags); /* Ldisc or user is trying to flush the buffers. We may have a deferred request to flush the @@ -469,7 +473,8 @@ static void flush_to_ldisc(struct work_struct *work) clear_bit(TTYP_FLUSHPENDING, &port->iflags); wake_up(&tty->read_wait); break; - } + } else if (!count) + break; } clear_bit(TTYP_FLUSHING, &port->iflags); } |