Le 09/12/2014 14:31, Cyrille Pitchen a écrit :
> -EDEFER error wasn't handle properly by atmel_serial_probe().
> As an example, when atmel_serial_probe() is called for the first time, we pass
> the test_and_set_bit() test to check whether the port has already been
> initalized. Then we call atmel_init_port(), which may return -EDEFER, possibly
> returned before by clk_get(). Consequently atmel_serial_probe() used to return
> this error code WITHOUT clearing the port bit in the "atmel_ports_in_use" mask.
> When atmel_serial_probe() was called for the second time, it used to fail on
> the test_and_set_bit() function then returning -EBUSY.
>
> When atmel_serial_probe() fails, this patch make it clear the port bit in the
> "atmel_ports_in_use" mask, if needed, before returning the error code.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
and you can also add:
Cc: <stable@xxxxxxxxxxxxxxx> # 3.12+
Thanks.
> ---
> drivers/tty/serial/atmel_serial.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index c6621dc..92a8b26 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -2565,7 +2565,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
>
> ret = atmel_init_port(port, pdev);
> if (ret)
> - goto err;
> + goto err_clear_bit;
>
> if (!atmel_use_pdc_rx(&port->uart)) {
> ret = -ENOMEM;
> @@ -2628,6 +2628,8 @@ err_alloc_ring:
> clk_put(port->clk);
> port->clk = NULL;
> }
> +err_clear_bit:
> + clear_bit(port->uart.line, atmel_ports_in_use);
> err:
> return ret;
> }
>
--
Nicolas Ferre
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