linux-kernel - [PATCH] perf/x86/intel/uncore: Fix invalid unit check

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Message-Id: <1625058955-172998-1-git-send-email-kan.liang@linux.intel.com>
Date:   Wed, 30 Jun 2021 06:15:55 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, gregkh@...uxfoundation.org,
        acme@...nel.org, linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, namhyung@...nel.org, jolsa@...hat.com,
        ak@...ux.intel.com, yao.jin@...ux.intel.com,
        Kan Liang <kan.liang@...ux.intel.com>, stable@...r.kernel.org
Subject: [PATCH] perf/x86/intel/uncore: Fix invalid unit check

From: Kan Liang <kan.liang@...ux.intel.com>

The uncore unit with the type ID 0 and the unit ID 0 is missed.

The table3 of the uncore unit maybe 0. The
uncore_discovery_invalid_unit() mistakenly treated it as an invalid
value.

Remove the !unit.table3 check.

Fixes: edae1f06c2cd ("perf/x86/intel/uncore: Parse uncore discovery tables")
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: stable@...r.kernel.org
---

The patch was posted as a part of the "perf: Add Sapphire Rapids server
uncore support" patch set. But it doesn't depend on the other patches in
the patch set. The bugfix can be accepted and merged separately. 

https://lore.kernel.org/lkml/cb0d2d43-102a-994c-f777-e11d61c77bf5@linux.intel.com/

 arch/x86/events/intel/uncore_discovery.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_discovery.h b/arch/x86/events/intel/uncore_discovery.h
index 1d65293..abfb1e8 100644
--- a/arch/x86/events/intel/uncore_discovery.h
+++ b/arch/x86/events/intel/uncore_discovery.h
@@ -30,7 +30,7 @@
 
 
 #define uncore_discovery_invalid_unit(unit)			\
-	(!unit.table1 || !unit.ctl || !unit.table3 ||	\
+	(!unit.table1 || !unit.ctl || \
 	 unit.table1 == -1ULL || unit.ctl == -1ULL ||	\
 	 unit.table3 == -1ULL)
 
-- 
2.7.4