On Fri, Jan 6, 2017 at 4:45 AM, Thadeu Lima de Souza Cascardo
<cascardo@xxxxxxxxxxxxxxx> wrote:
> The polling functions were checking for a NULL uart_state, which is
> indexed from uart_driver->state. It should be always allocated and
> non-NULL when the tty_driver is registered, and line should not be
> larger than the tty_driver->num anyways.
I'm not sure this is guaranteed. Let Peter to comment on it.
Peter, what is your opinion?
P.S. If Peter is okay with it, I don't see any problems with code itself either.
>
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxxxx>
> ---
> drivers/tty/serial/serial_core.c | 16 ++++------------
> 1 file changed, 4 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 9939c3d9912b..6f7247114ef8 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -2330,9 +2330,6 @@ static int uart_poll_init(struct tty_driver *driver, int line, char *options)
> int flow = 'n';
> int ret = 0;
>
> - if (!state)
> - return -1;
> -
> tport = &state->port;
> mutex_lock(&tport->mutex);
>
> @@ -2367,12 +2364,10 @@ static int uart_poll_get_char(struct tty_driver *driver, int line)
> struct uart_port *port;
> int ret = -1;
>
> - if (state) {
> - port = uart_port_ref(state);
> - if (port) {
> - ret = port->ops->poll_get_char(port);
> - uart_port_deref(port);
> - }
> + port = uart_port_ref(state);
> + if (port) {
> + ret = port->ops->poll_get_char(port);
> + uart_port_deref(port);
> }
> return ret;
> }
> @@ -2383,9 +2378,6 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
> struct uart_state *state = drv->state + line;
> struct uart_port *port;
>
> - if (!state)
> - return;
> -
> port = uart_port_ref(state);
> if (!port)
> return;
> --
> 2.11.0
>
--
With Best Regards,
Andy Shevchenko
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