Dan Carpenter says: The patch 640f763f98c2: "net: dsa: sja1105: Add support for Spanning Tree Protocol" from May 5, 2019, leads to the following static checker warning: drivers/net/dsa/sja1105/sja1105_main.c:1073 sja1105_stp_state_get() warn: signedness bug returning '(-22)' The caller doesn't check for negative errors anyway. Fixes: 640f763f98c2: ("net: dsa: sja1105: Add support for Spanning Tree Protocol") Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Signed-off-by: Vladimir Oltean <olteanv@xxxxxxxxx> --- drivers/net/dsa/sja1105/sja1105_main.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 4ccdbc80f7be..46f76b4c5618 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -1124,7 +1124,11 @@ static u8 sja1105_stp_state_get(struct sja1105_private *priv, int port) return BR_STATE_LEARNING; if (mac[port].ingress && mac[port].egress && mac[port].dyn_learn) return BR_STATE_FORWARDING; - return -EINVAL; + /* This is really an error condition if the MAC was in none of the STP + * states above. But treating the port as disabled does nothing, which + * is adequate, and it also resets the MAC to a known state later on. + */ + return BR_STATE_DISABLED; } /* For situations where we need to change a setting at runtime that is only -- 2.17.1