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mfd: mfd-core: Ensure disabled devices are ignored without error

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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 <icenowy@aosc.io>
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2020-08-19 09:16:50 +01:00
parent 6b6cf2b5de
commit 22380b65dc
1 changed files with 6 additions and 4 deletions
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10
drivers/mfd/mfd-core.c
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@ -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;