mfd: core: Delete corresponding OF node entries from list on MFD removal
When we consider MFD which implements hotplug (e.g. USB hotplug driver based on product and vendor IDs) functionality it turns out that its sub-devices are correctly matched with corresponding device tree nodes only at the first time. When physical device reboots or is replugged (and MFD driver is disconnected and probed back again) all sub-devices fails in mfd_add_device() with error 'Failed to locate of_node'. The reason of that behavior is that when any MFD sub-device is created for the first time (and matched with device tree node) it is added to the mfd_of_node_list. It looks like this list is never cleaned even if devices added there are intentionally removed from the system. So when MFD device is replugged and all sub-devices are matched with their device tree nodes again they fail as matched nodes already exist in mfd_of_node_list. In other words current implementation does not support MFD with hotplug feature. This commit extends MFD core for hotplugging support by removing appropriate OF node entry from mfd_of_node_list when corresponding device is removed from the system. Thanks to that when device is added once again it can be matched with its device tree node successfully. Signed-off-by: Michal Oleszczyk <oleszczyk.m@gmail.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220809060336.31892-1-m.oleszczyk@grinn-global.com
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@ -368,6 +368,7 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
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{
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{
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struct platform_device *pdev;
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struct platform_device *pdev;
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const struct mfd_cell *cell;
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const struct mfd_cell *cell;
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struct mfd_of_node_entry *of_entry, *tmp;
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int *level = data;
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int *level = data;
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if (dev->type != &mfd_dev_type)
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if (dev->type != &mfd_dev_type)
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@ -382,6 +383,12 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
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if (cell->swnode)
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if (cell->swnode)
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device_remove_software_node(&pdev->dev);
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device_remove_software_node(&pdev->dev);
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list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
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if (of_entry->dev == &pdev->dev) {
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list_del(&of_entry->list);
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kfree(of_entry);
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}
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regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
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regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
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cell->num_parent_supplies);
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cell->num_parent_supplies);
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