liquidio: Avoid double free during soft command

This patch is to resolve the double free issue by checking proper return
values from soft command.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/lio_ethtool.c

@@ -317,7 +317,7 @@ octnet_mdio45_access(struct lio *lio, int op, int loc, int *value)
 
 	retval = octeon_send_soft_command(oct_dev, sc);
 
-	if (retval) {
+	if (retval == IQ_SEND_FAILED) {
 		dev_err(&oct_dev->pci_dev->dev,
 			"octnet_mdio45_access instruction failed status: %x\n",
 			retval);
@@ -722,7 +722,7 @@ static int octnet_set_intrmod_cfg(void *oct, struct oct_intrmod_cfg *intr_cfg)
 	sc->wait_time = 1000;
 
 	retval = octeon_send_soft_command(oct_dev, sc);
-	if (retval) {
+	if (retval == IQ_SEND_FAILED) {
 		octeon_free_soft_command(oct_dev, sc);
 		return -EINVAL;
 	}

drivers/net/ethernet/cavium/liquidio/lio_main.c

@@ -2583,7 +2583,7 @@ static inline int send_nic_timestamp_pkt(struct octeon_device *oct,
 	retval = octeon_send_command(oct, sc->iq_no, ring_doorbell, &sc->cmd,
 				     sc, ih->dlengsz, ndata->reqtype);
 
-	if (retval) {
+	if (retval == IQ_SEND_FAILED) {
 		dev_err(&oct->pci_dev->dev, "timestamp data packet failed status: %x\n",
 			retval);
 		octeon_free_soft_command(oct, sc);
@@ -3192,7 +3192,7 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 		sc->wait_time = 1000;
 
 		retval = octeon_send_soft_command(octeon_dev, sc);
-		if (retval) {
+		if (retval == IQ_SEND_FAILED) {
 			dev_err(&octeon_dev->pci_dev->dev,
 				"iq/oq config failed status: %x\n",
 				retval);

drivers/net/ethernet/cavium/liquidio/octeon_nic.c

@@ -178,7 +178,7 @@ octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
 	}
 
 	retval = octeon_send_soft_command(oct, sc);
-	if (retval) {
+	if (retval == IQ_SEND_FAILED) {
 		octeon_free_soft_command(oct, sc);
 		dev_err(&oct->pci_dev->dev, "%s soft command send failed status: %x\n",
 			__func__, retval);