diff options
Diffstat (limited to 'drivers/tty/tty_buffer.c')
| -rw-r--r-- | drivers/tty/tty_buffer.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index c996b6859c5e..77070c2d1240 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -118,9 +118,12 @@ void tty_buffer_free_all(struct tty_port *port) struct tty_bufhead *buf = &port->buf; struct tty_buffer *p, *next; struct llist_node *llist; + unsigned int freed = 0; + int still_used; while ((p = buf->head) != NULL) { buf->head = p->next; + freed += p->size; if (p->size > 0) kfree(p); } @@ -132,7 +135,9 @@ void tty_buffer_free_all(struct tty_port *port) buf->head = &buf->sentinel; buf->tail = &buf->sentinel; - atomic_set(&buf->mem_used, 0); + still_used = atomic_xchg(&buf->mem_used, 0); + WARN(still_used != freed, "we still have not freed %d bytes!", + still_used - freed); } /** @@ -468,11 +473,15 @@ receive_buf(struct tty_port *port, struct tty_buffer *head, int count) { unsigned char *p = char_buf_ptr(head, head->read); char *f = NULL; + int n; if (~head->flags & TTYB_NORMAL) f = flag_buf_ptr(head, head->read); - return port->client_ops->receive_buf(port, p, f, count); + n = port->client_ops->receive_buf(port, p, f, count); + if (n > 0) + memset(p, 0, n); + return n; } /** |