linux-kernel - [PATCH v2] mfd: core: Delete corresponding OF node entries from list on MFD removal

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Date:   Tue,  9 Aug 2022 08:03:36 +0200
From:   "Michał Oleszczyk" <oleszczyk.m@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lee Jones <lee@...nel.org>,
        Michał Oleszczyk <m.oleszczyk@...nn-global.com>,
        Michal Oleszczyk <oleszczyk.m@...il.com>
Subject: [PATCH v2] mfd: core: Delete corresponding OF node entries from list on  MFD removal

From: Michal Oleszczyk <oleszczyk.m@...il.com>

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@...il.com>
---

Changes in v2: removing unused variable declaration.

 drivers/mfd/mfd-core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 684a011a6396..a9646a03ca8d 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -351,6 +351,7 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 {
 	struct platform_device *pdev;
 	const struct mfd_cell *cell;
+	struct mfd_of_node_entry *of_entry, *tmp;
 	int *level = data;

 	if (dev->type != &mfd_dev_type)
@@ -365,6 +366,12 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 	if (cell->swnode)
 		device_remove_software_node(&pdev->dev);

+	list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
+		if (of_entry->dev == &pdev->dev) {
+			list_del(&of_entry->list);
+			kfree(of_entry);
+		}
+
 	regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
 					       cell->num_parent_supplies);

-- 
2.20.1