linux-kernel - [net-next PATCH 2/2] mlxsw: spectrum_kvdl: avoid uninitialized variable warning

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Message-Id: <20180223131540.1065413-2-arnd@arndb.de>
Date:   Fri, 23 Feb 2018 14:15:32 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Arkadi Sharshevsky <arkadis@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Wei Yongjun <weiyongjun1@...wei.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [net-next PATCH 2/2] mlxsw: spectrum_kvdl: avoid uninitialized variable warning

gcc warns that 'resource_id' is not initialized if we don't come though
any of the three 'case' statements before:

drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c: In function 'mlxsw_sp_kvdl_part_init':
drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c:275:8: error: 'resource_id' may be used uninitialized in this function [-Werror=maybe-uninitialized]

In the current code, that won't happen, but it's more robust to explicitly
handle this by returning a failure from mlxsw_sp_kvdl_part_init.

Fixes: 887839e6960d ("mlxsw: spectrum_kvdl: Add support for dynamic partition set")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
index 6fd701db90c9..059eb3214328 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
@@ -270,6 +270,8 @@ static int mlxsw_sp_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
 	case MLXSW_SP_KVDL_PART_LARGE_CHUNKS:
 		resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS;
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	err = devlink_resource_size_get(devlink, resource_id, &resource_size);
-- 
2.9.0