在 2020-08-19星期三的 11:54 +0100，Lee Jones写道：
> Commit e49aa9a9bd22 ("mfd: core: Make a best effort attempt to match
> devices with the correct of_nodes") changed the semantics for
> disabled
> devices in mfd_add_device(). Instead of silently ignoring a disabled
> child device, an error was returned. On receipt of the error
> mfd_add_devices() the precedes to remove *all* child devices and
> returns an all-failed error to the caller, which will inevitably fail
> the parent device as well.
>
> This patch reverts back to the old semantics and ignores child
> devices
> which are disabled in Device Tree.
>
> Fixes: e49aa9a9bd22 ("mfd: core: Make a best effort attempt to match
> devices with the correct of_nodes")
> Reported-by: Icenowy Zheng <icen...@aosc.io>
> Signed-off-by: Lee Jones <lee.jo...@linaro.org>
Tested-by: Icenowy Zheng <icen...@aosc.io>
> ---
> drivers/mfd/mfd-core.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index c3651f06684fa..30f90a15ceaab 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -126,10 +126,6 @@ static int mfd_match_of_node_to_dev(struct
> platform_device *pdev,
> const __be32 *reg;
> u64 of_node_addr;
>
> - /* Skip devices 'disabled' by Device Tree */
> - if (!of_device_is_available(np))
> - return -ENODEV;
> -
> /* Skip if OF node has previously been allocated to a device */
> list_for_each_entry(of_entry, &mfd_of_node_list, list)
> if (of_entry->np == np)
> @@ -212,6 +208,12 @@ static int mfd_add_device(struct device *parent,
> int id,
> if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell-
> >of_compatible) {
> for_each_child_of_node(parent->of_node, np) {
> if (of_device_is_compatible(np, cell-
> >of_compatible)) {
> + /* Ignore 'disabled' devices error free
> */
> + if (!of_device_is_available(np)) {
> + ret = 0;
> + goto fail_alias;
> + }
> +
> ret = mfd_match_of_node_to_dev(pdev,
> np, cell);
> if (ret == -EAGAIN)
> continue;
