net: dsa: qca8k: return with -EINVAL on invalid port

Currently an invalid port throws a WARN_ON warning however invalid
uninitialized values in reg and cpu_port_index are being used later
on. Fix this by returning -EINVAL for an invalid port value.

Addresses clang-scan warnings:
drivers/net/dsa/qca8k.c:1981:3: warning: 2nd function call argument is an
  uninitialized value [core.CallAndMessage]
drivers/net/dsa/qca8k.c:1999:9: warning: 2nd function call argument is an
  uninitialized value [core.CallAndMessage]

Fixes: 7544b3ff745b ("net: dsa: qca8k: move pcs configuration")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220224220557.147075-1-colin.i.king@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 6844106975a94be79647c579be908da1d266764b..990ed3b07d3ce8f4020ef5b5825faba918bf5c88 100644 (file)
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1937,6 +1937,7 @@ static int qca8k_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
 
        default:
                WARN_ON(1);
+               return -EINVAL;
        }
 
        /* Enable/disable SerDes auto-negotiation as necessary */