Hi Ralf,
> On Oct 17, 2016, at 16:59 , 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>
> ---
> drivers/i2c/i2c-core.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 5ab6721..1704fc8 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1681,6 +1681,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
> static void of_i2c_register_devices(struct i2c_adapter *adap)
> {
> struct device_node *bus, *node;
> + struct i2c_client *client;
>
> /* Only register child devices if the adapter has a node pointer set */
> if (!adap->dev.of_node)
> @@ -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);
> + of_node_clear_flag(node, OF_POPULATED);
> + }
> }
>
> of_node_put(bus);
> @@ -2299,6 +2307,7 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
> if (IS_ERR(client)) {
> dev_err(&adap->dev, "failed to create client for '%s'\n",
> rd->dn->full_name);
> + of_node_clear_flag(rd->dn, OF_POPULATED);
> return notifier_from_errno(PTR_ERR(client));
> }
> break;
> --
> 2.10.1
>
Thanks for this
Acked-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
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