linux-kernel - [PATCH] perf/x86/intel/uncore: Fix uninitialized variable in skx_upi_topology

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Date:   Mon, 28 Nov 2022 15:11:34 +0000
From:   alexander.antonov@...ux.intel.com
To:     peterz@...radead.org, linux-kernel@...r.kernel.org
Cc:     kan.liang@...ux.intel.com, alexey.v.bayduraev@...ux.intel.com,
        alexander.antonov@...ux.intel.com
Subject: [PATCH] perf/x86/intel/uncore: Fix uninitialized variable in skx_upi_topology_cb()

From: Alexander Antonov <alexander.antonov@...ux.intel.com>

Fix the following warning in recently merged patch:

> config: x86_64-randconfig-m001
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
>
> smatch warnings:
> arch/x86/events/intel/uncore_snbep.c:4345 skx_upi_topology_cb() error: uninitialized symbol 'ret'.

Fixes: c1c1942b49ea ("perf/x86/intel/uncore: Enable UPI topology discovery for Skylake Server")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Signed-off-by: Alexander Antonov <alexander.antonov@...ux.intel.com>
---
 arch/x86/events/intel/uncore_snbep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 44c2f879f708..db6586e12bcb 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -4340,7 +4340,7 @@ static int upi_fill_topology(struct pci_dev *dev, struct intel_uncore_topology *
 static int skx_upi_topology_cb(struct intel_uncore_type *type, int segment,
 				int die, u64 cpu_bus_msr)
 {
-	int idx, ret;
+	int idx, ret = -ENODEV;
 	struct intel_uncore_topology *upi;
 	unsigned int devfn;
 	struct pci_dev *dev = NULL;

base-commit: 415db869ef56751c4ab72f0f58cd7224213bb357
-- 
2.25.1