[PATCH v2] Bluetooth: btintel_pcie: Fix build error when CONFIG_ACPI is disabled

[Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>]

btintel_pcie_acpi_reset_method() uses ACPI APIs such as
acpi_evaluate_object() and acpi_has_method() which are not available
when CONFIG_ACPI is disabled, causing build errors on architectures
that lack ACPI support.

Guard btintel_pcie_acpi_reset_method() and btintel_pcie_perform_pldr()
with IS_ENABLED(CONFIG_ACPI). Since PLDR relies entirely on ACPI reset
methods, skip the entire PLDR flow when ACPI is not enabled instead of
unnecessarily unbinding and reprobing WiFi with no actual reset.

Fixes: 912a499a7955 ("Bluetooth: btintel_pcie: Support Product level reset")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
---
v1 -> v2:
  - Guard btintel_pcie_perform_pldr() along with
    btintel_pcie_acpi_reset_method() under IS_ENABLED(CONFIG_ACPI)
    instead of providing a separate stub for the ACPI method, since
    PLDR is meaningless without ACPI support (Paul).
  - Tested with CONFIG_ACPI=y, CONFIG_ACPI disabled, and 0day CI
    alpha config.

 drivers/bluetooth/btintel_pcie.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c
index 076beb45c410..07223965388a 100644
--- a/drivers/bluetooth/btintel_pcie.c
+++ b/drivers/bluetooth/btintel_pcie.c
@@ -2280,6 +2280,7 @@ static void btintel_pcie_inc_recovery_count(struct pci_dev *pdev,
 static int btintel_pcie_setup_hdev(struct btintel_pcie_data *data);
 static void btintel_pcie_reset(struct hci_dev *hdev);
 
+#if IS_ENABLED(CONFIG_ACPI)
 static int btintel_pcie_acpi_reset_method(struct btintel_pcie_data *data)
 {
 	union acpi_object *obj, argv4;
@@ -2389,6 +2390,12 @@ static void btintel_pcie_perform_pldr(struct btintel_pcie_data *data)
 			BT_ERR("BT reprobe failed for BDF:%s", pci_name(pdev));
 	}
 }
+#else
+static void btintel_pcie_perform_pldr(struct btintel_pcie_data *data)
+{
+	bt_dev_warn(data->hdev, "PLDR not supported, ACPI is disabled");
+}
+#endif
 
 static void btintel_pcie_reset_work(struct work_struct *wk)
 {
-- 
2.43.0