unsigned int tty_buffer_space_avail(struct tty_port *port)
{
int space = port->buf.mem_limit - atomic_read(&port->buf.mem_used);
+
return max(space, 0);
}
EXPORT_SYMBOL_GPL(tty_buffer_space_avail);
const unsigned char *chars, char flag, size_t size)
{
int copied = 0;
+
do {
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
int space = __tty_buffer_request_room(port, goal, flags);
struct tty_buffer *tb = port->buf.tail;
+
if (unlikely(space == 0))
break;
memcpy(char_buf_ptr(tb, tb->used), chars, space);
const unsigned char *chars, const char *flags, size_t size)
{
int copied = 0;
+
do {
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
int space = tty_buffer_request_room(port, goal);
struct tty_buffer *tb = port->buf.tail;
+
if (unlikely(space == 0))
break;
memcpy(char_buf_ptr(tb, tb->used), chars, space);
size_t size)
{
int space = __tty_buffer_request_room(port, size, TTYB_NORMAL);
+
if (likely(space)) {
struct tty_buffer *tb = port->buf.tail;
+
*chars = char_buf_ptr(tb, tb->used);
if (~tb->flags & TTYB_NORMAL)
memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);