From 59bc9cb3b80abaa42643abede0d5db8477901d9c Mon Sep 17 00:00:00 2001
From: Jeff LaBundy <jeff@labundy.com>
Date: Tue, 3 Jan 2023 11:58:31 -0600
Subject: [PATCH] Input: iqs269a - drop unused device node references
Git-commit: 59bc9cb3b80abaa42643abede0d5db8477901d9c
Patch-mainline: v6.3-rc1
References: git-fixes

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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 8348d8c85e1d..7cda4a9a8560 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:
-- 
2.35.3