linux-kernel - [PATCH v3 1/2] drivers: net: ethernet: 3com: fix return value

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Date:   Sun, 25 Dec 2016 01:30:21 +0100
From:   Thomas Preisner <thomas.preisner+linux@....de>
To:     sergei.shtylyov@...entembedded.com
Cc:     dave@...dillows.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kernel@...cs.fau.de,
        milan.stephan+linux@....de, thomas.preisner+linux@....de
Subject: [PATCH v3 1/2] drivers: net: ethernet: 3com: fix return value

In a few cases the err-variable is not set to a negative error code if a
function call fails and thus 0 is returned instead.
It may be better to set err to the appropriate negative error code
before returning.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188841

Reported-by: Pan Bian <bianpan2016@....com>
Signed-off-by: Thomas Preisner <thomas.preisner+linux@....de>
Signed-off-by: Milan Stephan <milan.stephan+linux@....de>
---
 drivers/net/ethernet/3com/typhoon.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/3com/typhoon.c b/drivers/net/ethernet/3com/typhoon.c
index a0cacbe..c88b88a 100644
--- a/drivers/net/ethernet/3com/typhoon.c
+++ b/drivers/net/ethernet/3com/typhoon.c
@@ -2404,6 +2404,7 @@ typhoon_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
-	if(!is_valid_ether_addr(dev->dev_addr)) {
+	if (!is_valid_ether_addr(dev->dev_addr)) {
 		err_msg = "Could not obtain valid ethernet address, aborting";
+		err = -EIO;
 		goto error_out_reset;
 	}
 
@@ -2411,7 +2412,8 @@ typhoon_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 * later when we print out the version reported.
 	 */
 	INIT_COMMAND_WITH_RESPONSE(&xp_cmd, TYPHOON_CMD_READ_VERSIONS);
-	if(typhoon_issue_command(tp, 1, &xp_cmd, 3, xp_resp) < 0) {
+	err = typhoon_issue_command(tp, 1, &xp_cmd, 3, xp_resp);
+	if (err < 0) {
 		err_msg = "Could not get Sleep Image version";
 		goto error_out_reset;
 	}
@@ -2453,7 +2455,8 @@ typhoon_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dev->features = dev->hw_features |
 		NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_RXCSUM;
 
-	if(register_netdev(dev) < 0) {
+	err = register_netdev(dev);
+	if (err < 0) {
 		err_msg = "unable to register netdev";
 		goto error_out_reset;
 	}
-- 
2.7.4