On Mon, Oct 17, 2016 at 3:59 PM, Ralf Ramsauer
<ralf@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Instantiated I2C device nodes are marked with OF_POPULATE. This was
> introduced in 4f001fd. On unloading, loaded device nodes will of course
> be unmarked. The problem are nodes that fail during initialisation: If a
> node fails, it won't be unloaded and hence not be unmarked.
>
> If a I2C driver module is unloaded and reloaded, it will skip nodes that
> failed before.
>
> Skip device nodes that are already populated and mark them only in case
> of success.
>
> Note that the same issue exists for SPI.
>
> Fixes: 4f001fd ("i2c: Mark instantiated device nodes with OF_POPULATE")
> Signed-off-by: Ralf Ramsauer <ralf@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1695,7 +1696,14 @@ static void of_i2c_register_devices(struct i2c_adapter *adap)
> for_each_available_child_of_node(bus, node) {
> if (of_node_test_and_set_flag(node, OF_POPULATED))
> continue;
> - of_i2c_register_device(adap, node);
> +
> + client = of_i2c_register_device(adap, node);
> + if (IS_ERR(client)) {
> + dev_warn(&adap->dev,
> + "Failed to create I2C device for %s\n",
> + node->full_name);
I don't think there's a need to add this warning, as of_i2c_register_device()
already prints messages in all failure paths.
> + of_node_clear_flag(node, OF_POPULATED);
> + }
> }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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