net: enetc: catch negative return code from enetc_pf_to_port()

After the refactoring introduced in commit 87614b93 ("net: enetc:
create a common enetc_pf_to_port helper"), enetc_pf_to_port was coded up
to return -1 in case the passed PCIe device does not have a recognized
BDF.

Make sure the -1 value is checked by the callers, to appease static
checkers.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc_qos.c

@@ -465,8 +465,13 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 	struct streamid_conf *si_conf;
 	u16 data_size;
 	dma_addr_t dma;
+	int port;
 	int err;
 
+	port = enetc_pf_to_port(priv->si->pdev);
+	if (port < 0)
+		return -EINVAL;
+
 	if (sid->index >= priv->psfp_cap.max_streamid)
 		return -EINVAL;
 
@@ -499,7 +504,7 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 
 	si_conf = &cbd.sid_set;
 	/* Only one port supported for one entry, set itself */
-	si_conf->iports = cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
+	si_conf->iports = cpu_to_le32(1 << port);
 	si_conf->id_type = 1;
 	si_conf->oui[2] = 0x0;
 	si_conf->oui[1] = 0x80;
@@ -524,7 +529,7 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 
 	si_conf->en = 0x80;
 	si_conf->stream_handle = cpu_to_le32(sid->handle);
-	si_conf->iports = cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
+	si_conf->iports = cpu_to_le32(1 << port);
 	si_conf->id_type = sid->filtertype;
 	si_conf->oui[2] = 0x0;
 	si_conf->oui[1] = 0x80;
@@ -567,6 +572,11 @@ static int enetc_streamfilter_hw_set(struct enetc_ndev_priv *priv,
 {
 	struct enetc_cbd cbd = {.cmd = 0};
 	struct sfi_conf *sfi_config;
+	int port;
+
+	port = enetc_pf_to_port(priv->si->pdev);
+	if (port < 0)
+		return -EINVAL;
 
 	cbd.index = cpu_to_le16(sfi->index);
 	cbd.cls = BDCR_CMD_STREAM_FILTER;
@@ -586,8 +596,7 @@ static int enetc_streamfilter_hw_set(struct enetc_ndev_priv *priv,
 	}
 
 	sfi_config->sg_inst_table_index = cpu_to_le16(sfi->gate_id);
-	sfi_config->input_ports =
-		cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
+	sfi_config->input_ports = cpu_to_le32(1 << port);
 
 	/* The priority value which may be matched against the
 	 * frame’s priority value to determine a match for this entry.
@@ -1548,7 +1557,7 @@ int enetc_setup_tc_psfp(struct net_device *ndev, void *type_data)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 	struct flow_block_offload *f = type_data;
-	int err;
+	int port, err;
 
 	err = flow_block_cb_setup_simple(f, &enetc_block_cb_list,
 					 enetc_setup_tc_block_cb,
@@ -1558,10 +1567,18 @@ int enetc_setup_tc_psfp(struct net_device *ndev, void *type_data)
 
 	switch (f->command) {
 	case FLOW_BLOCK_BIND:
-		set_bit(enetc_pf_to_port(priv->si->pdev), &epsfp.dev_bitmap);
+		port = enetc_pf_to_port(priv->si->pdev);
+		if (port < 0)
+			return -EINVAL;
+
+		set_bit(port, &epsfp.dev_bitmap);
 		break;
 	case FLOW_BLOCK_UNBIND:
-		clear_bit(enetc_pf_to_port(priv->si->pdev), &epsfp.dev_bitmap);
+		port = enetc_pf_to_port(priv->si->pdev);
+		if (port < 0)
+			return -EINVAL;
+
+		clear_bit(port, &epsfp.dev_bitmap);
 		if (!epsfp.dev_bitmap)
 			clean_psfp_all();
 		break;