linux-kernel - [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

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Message-Id: <20230413012922.1521377-1-david.e.box@linux.intel.com>
Date:   Wed, 12 Apr 2023 18:29:22 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     david.e.box@...ux.intel.com, hdegoede@...hat.com,
        markgross@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

On Intel Xeon, unused PMT regions will have uninitialized discovery headers
containing all 0xF. Instead of returning an error, just skip the region.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/pmt/telemetry.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
index 71cdef42084a..39cbc87cc28a 100644
--- a/drivers/platform/x86/intel/pmt/telemetry.c
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -78,7 +78,7 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
 	 * reserved for future use. They have zero size. Do not fail
 	 * probe for these. Just ignore them.
 	 */
-	if (header->size == 0)
+	if (header->size == 0 || header->access_type == 0xF)
 		return 1;
 
 	return 0;

base-commit: 5b309e80f457ebb41770e0122766825a78cfc11b
prerequisite-patch-id: a3bf21940fa02eb2f3adb4bd2d3a93df14df077a
-- 
2.34.1