6.10-stable review patch. If anyone has any objections, please let me know.
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From: Javier Carrasco javier.carrasco.cruz@gmail.com
[ Upstream commit ffbf1fcb421429916a861cfc25dfe0c6387dda75 ]
The current implementation accesses the `child` fwnode handle outside of fwnode_for_each_available_child_node() without incrementing its refcount. Add the missing call to `fwnode_handle_get(child)`.
The cleanup process where `child` is accessed is not right either because a single call to `fwnode_handle_put()` is carried out in case of an error, ignoring unasigned nodes at the point when the error happens. Keep `child` inside of the first loop, and use the helper pointer that receives references via `fwnode_handle_get()` to handle the child nodes within the second loop.
Moreover, the iterated nodes are direct children of the device node, and the `device_for_each_child_node()` macro accounts for child node availability. By restricting `child` to live within that loop, the scoped version of it can be used to simplify the error handling.
`fwnode_for_each_available_child_node()` is meant to access the child nodes of an fwnode, and therefore not direct child nodes of the device node.
Use `device_for_each_child_node_scoped()` to indicate device's direct child nodes.
Fixes: 8325642d2757 ("leds: bd2606mvv: Driver for the Rohm 6 Channel i2c LED driver") Signed-off-by: Javier Carrasco javier.carrasco.cruz@gmail.com Link: https://lore.kernel.org/r/20240721-device_for_each_child_node-available-v2-3... Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/leds/leds-bd2606mvv.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-)
diff --git a/drivers/leds/leds-bd2606mvv.c b/drivers/leds/leds-bd2606mvv.c index 3fda712d2f809..c1181a35d0f76 100644 --- a/drivers/leds/leds-bd2606mvv.c +++ b/drivers/leds/leds-bd2606mvv.c @@ -69,16 +69,14 @@ static const struct regmap_config bd2606mvv_regmap = {
static int bd2606mvv_probe(struct i2c_client *client) { - struct fwnode_handle *np, *child; struct device *dev = &client->dev; struct bd2606mvv_priv *priv; struct fwnode_handle *led_fwnodes[BD2606_MAX_LEDS] = { 0 }; int active_pairs[BD2606_MAX_LEDS / 2] = { 0 }; int err, reg; - int i; + int i, j;
- np = dev_fwnode(dev); - if (!np) + if (!dev_fwnode(dev)) return -ENODEV;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -94,20 +92,18 @@ static int bd2606mvv_probe(struct i2c_client *client)
i2c_set_clientdata(client, priv);
- fwnode_for_each_available_child_node(np, child) { + device_for_each_child_node_scoped(dev, child) { struct bd2606mvv_led *led;
err = fwnode_property_read_u32(child, "reg", ®); - if (err) { - fwnode_handle_put(child); + if (err) return err; - } - if (reg < 0 || reg >= BD2606_MAX_LEDS || led_fwnodes[reg]) { - fwnode_handle_put(child); + + if (reg < 0 || reg >= BD2606_MAX_LEDS || led_fwnodes[reg]) return -EINVAL; - } + led = &priv->leds[reg]; - led_fwnodes[reg] = child; + led_fwnodes[reg] = fwnode_handle_get(child); active_pairs[reg / 2]++; led->priv = priv; led->led_no = reg; @@ -130,7 +126,8 @@ static int bd2606mvv_probe(struct i2c_client *client) &priv->leds[i].ldev, &init_data); if (err < 0) { - fwnode_handle_put(child); + for (j = i; j < BD2606_MAX_LEDS; j++) + fwnode_handle_put(led_fwnodes[j]); return dev_err_probe(dev, err, "couldn't register LED %s\n", priv->leds[i].ldev.name);