From ef195e8a7f43924b9979b2cd81ac7fa54f24bb3c Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Tue, 17 Aug 2021 15:40:17 -0700 Subject: [PATCH] platform/x86: intel_pmt_telemetry: Ignore zero sized entries Some devices may expose non-functioning entries that are reserved for future use. These entries have zero size. Ignore them during probe. Signed-off-by: David E. Box Link: https://lore.kernel.org/r/20210817224018.1013192-5-david.e.box@linux.intel.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/x86/intel/pmt/telemetry.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c index a58843360fbf..38d52651c572 100644 --- a/drivers/platform/x86/intel/pmt/telemetry.c +++ b/drivers/platform/x86/intel/pmt/telemetry.c @@ -61,6 +61,14 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry, /* Size is measured in DWORDS, but accessor returns bytes */ header->size = TELEM_SIZE(readl(disc_table)); + /* + * Some devices may expose non-functioning entries that are + * reserved for future use. They have zero size. Do not fail + * probe for these. Just ignore them. + */ + if (header->size == 0) + return 1; + return 0; }