[PATCH 6.1.y 2/4] platform/x86/intel/vsec: Create wrapper to walk PCI config space

[Sasha Levin <sashal@kernel.org>]

From: "David E. Box" <david.e.box@linux.intel.com>

[ Upstream commit b0631f8a5740c55b52d02174cc4c9c84cc7a16a1 ]

Combine three PCI config space walkers — intel_vsec_walk_dvsec(),
intel_vsec_walk_vsec(), and intel_vsec_walk_header() — into a new wrapper
function, intel_vsec_feature_walk().  This refactoring simplifies the probe
logic and lays the groundwork for future patches that will loop over these
calls. No functional changes.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20250703022832.1302928-4-david.e.box@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Stable-dep-of: 348ccc754d89 ("platform/x86/intel/vsec: Fix enable_cnt imbalance on PCIe error recovery")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/platform/x86/intel/vsec.c | 38 +++++++++++++++++++++----------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 1a9f8267b0b07..e31e5db593401 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -376,11 +376,35 @@ static bool intel_vsec_walk_vsec(struct pci_dev *pdev,
 	return have_devices;
 }
 
+static bool intel_vsec_get_features(struct pci_dev *pdev,
+				    struct intel_vsec_platform_info *info)
+{
+	bool found = false;
+
+	/*
+	 * Both DVSEC and VSEC capabilities can exist on the same device,
+	 * so both intel_vsec_walk_dvsec() and intel_vsec_walk_vsec() must be
+	 * called independently. Additionally, intel_vsec_walk_header() is
+	 * needed for devices that do not have VSEC/DVSEC but provide the
+	 * information via device_data.
+	 */
+	if (intel_vsec_walk_dvsec(pdev, info))
+		found = true;
+
+	if (intel_vsec_walk_vsec(pdev, info))
+		found = true;
+
+	if (info && (info->quirks & VSEC_QUIRK_NO_DVSEC) &&
+	    intel_vsec_walk_header(pdev, info))
+		found = true;
+
+	return found;
+}
+
 static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct intel_vsec_platform_info *info;
 	struct vsec_priv *priv;
-	bool have_devices = false;
 	int ret;
 
 	ret = pcim_enable_device(pdev);
@@ -399,17 +423,7 @@ static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id
 	priv->info = info;
 	pci_set_drvdata(pdev, priv);
 
-	if (intel_vsec_walk_dvsec(pdev, info))
-		have_devices = true;
-
-	if (intel_vsec_walk_vsec(pdev, info))
-		have_devices = true;
-
-	if (info && (info->quirks & VSEC_QUIRK_NO_DVSEC) &&
-	    intel_vsec_walk_header(pdev, info))
-		have_devices = true;
-
-	if (!have_devices)
+	if (!intel_vsec_get_features(pdev, info))
 		return -ENODEV;
 
 	return 0;
-- 
2.53.0