[PATCH v4 4/6] gpio: acpi: use guard(mutex) for conn_lock

[Marco Scardovi <mscardovi95@gmail.com>]

Replace manual mutex_lock() and mutex_unlock() calls in
acpi_gpio_adr_space_handler() with the guard(mutex) helper. This
ensures the conn_lock is automatically released when exiting the
scope, preventing potential deadlocks and simplifying the logic.

Signed-off-by: Marco Scardovi <mscardovi95@gmail.com>
---
 drivers/gpio/gpiolib-acpi-core.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi-core.c b/drivers/gpio/gpiolib-acpi-core.c
index e53d68578024..33d6c3b6cdf0 100644
--- a/drivers/gpio/gpiolib-acpi-core.c
+++ b/drivers/gpio/gpiolib-acpi-core.c
@@ -1123,7 +1123,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 		u16 word, shift;
 		bool found;
 
-		mutex_lock(&achip->conn_lock);
+		guard(mutex)(&achip->conn_lock);
 
 		found = false;
 		list_for_each_entry(conn, &achip->conns, node) {
@@ -1155,17 +1155,15 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 		if (!found) {
 			desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
 			if (IS_ERR(desc)) {
-				mutex_unlock(&achip->conn_lock);
 				status = AE_ERROR;
-				goto out;
+				break;
 			}
 
 			conn = kzalloc_obj(*conn);
 			if (!conn) {
 				gpiochip_free_own_desc(desc);
-				mutex_unlock(&achip->conn_lock);
 				status = AE_NO_MEMORY;
-				goto out;
+				break;
 			}
 
 			conn->pin = pin;
@@ -1173,8 +1171,6 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 			list_add_tail(&conn->node, &achip->conns);
 		}
 
-		mutex_unlock(&achip->conn_lock);
-
 		/*
 		 * For the cases when OperationRegion() consists of more than
 		 * 64 bits calculate the word and bit shift to use that one to
-- 
2.54.0