linux-kernel - [PATCH] platform/x86/intel-uncore-freq: Don't present root domain on error

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Date: Mon, 15 Apr 2024 14:52:10 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	stable@...r.kernel.org
Subject: [PATCH] platform/x86/intel-uncore-freq: Don't present root domain on error

If none of the clusters are added because of some error, fail to load
driver without presenting root domain. In this case root domain will
present invalid data.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Fixes: 01c10f88c9b7 ("platform/x86/intel-uncore-freq: tpmi: Provide cluster level control")
Cc: <stable@...r.kernel.org> # 6.5+
---
This error can be reproduced in the pre production hardware only.
So can go through regular cycle and they apply to stable.

 .../x86/intel/uncore-frequency/uncore-frequency-tpmi.c     | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
index bd75d61ff8a6..587437211d72 100644
--- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
+++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
@@ -240,6 +240,7 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
 	bool read_blocked = 0, write_blocked = 0;
 	struct intel_tpmi_plat_info *plat_info;
 	struct tpmi_uncore_struct *tpmi_uncore;
+	bool uncore_sysfs_added = false;
 	int ret, i, pkg = 0;
 	int num_resources;
 
@@ -384,9 +385,15 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
 			}
 			/* Point to next cluster offset */
 			cluster_offset >>= UNCORE_MAX_CLUSTER_PER_DOMAIN;
+			uncore_sysfs_added = true;
 		}
 	}
 
+	if (!uncore_sysfs_added) {
+		ret = -ENODEV;
+		goto remove_clusters;
+	}
+
 	auxiliary_set_drvdata(auxdev, tpmi_uncore);
 
 	tpmi_uncore->root_cluster.root_domain = true;
-- 
2.40.1