[PATCH 5.15 110/245] Input: iqs269a - drop unused device node references

Greg Kroah-Hartman
2024-02-27T14:05:59Z

From: Jeff LaBundy <jeff@labundy.com>

[ Upstream commit 59bc9cb3b80abaa42643abede0d5db8477901d9c ]

Each call to device/fwnode_get_named_child_node() must be matched
with a call to fwnode_handle_put() once the corresponding node is
no longer in use. This ensures a reference count remains balanced
in the case of dynamic device tree support.

Currently, the driver does not call fwnode_handle_put() on nested
event nodes. This patch solves this problem by adding the missing
instances of fwnode_handle_put().

As part of this change, the logic which parses each channel's key
code is gently refactored in order to reduce the number of places
from which fwnode_handle_put() is called.

Fixes: 04e49867fad1 ("Input: add support for Azoteq IQS269A")
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/Y7Rsx68k/gvDVXAt@nixie71
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/misc/iqs269a.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/input/misc/iqs269a.c b/drivers/input/misc/iqs269a.c
index a348247d3d38f..ea3c97c5f764f 100644
--- a/drivers/input/misc/iqs269a.c
+++ b/drivers/input/misc/iqs269a.c
@@ -694,6 +694,7 @@ static int iqs269_parse_chan(struct iqs269_private *iqs269,
dev_err(&client->dev,
"Invalid channel %u threshold: %u\n",
reg, val);
+ fwnode_handle_put(ev_node);
return -EINVAL;
}

@@ -707,6 +708,7 @@ static int iqs269_parse_chan(struct iqs269_private *iqs269,
dev_err(&client->dev,
"Invalid channel %u hysteresis: %u\n",
reg, val);
+ fwnode_handle_put(ev_node);
return -EINVAL;
}

@@ -721,8 +723,16 @@ static int iqs269_parse_chan(struct iqs269_private *iqs269,
}
}

- if (fwnode_property_read_u32(ev_node, "linux,code", &val))
+ error = fwnode_property_read_u32(ev_node, "linux,code", &val);
+ fwnode_handle_put(ev_node);
+ if (error == -EINVAL) {
continue;
+ } else if (error) {
+ dev_err(&client->dev,
+ "Failed to read channel %u code: %d\n", reg,
+ error);
+ return error;
+ }

switch (reg) {
case IQS269_CHx_HALL_ACTIVE:
--
2.43.0