net: hns: set correct return value

net: hns: set correct return value

[Pan Bian]

The function of_parse_phandle() returns a NULL pointer if it cannot
resolve a phandle property to a device_node pointer. In function
hns_nic_dev_probe(), its return value is passed to PTR_ERR to extract
the error code. However, in this case, the extracted error code will
always be zero, which is unexpected.

Signed-off-by: Pan Bian <bianpan2016@163.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 3652063..e771926 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -2369,8 +2369,8 @@ static int hns_nic_dev_probe(struct platform_device *pdev)
 			priv->enet_ver = AE_VERSION_2;
 
 		ae_node = of_parse_phandle(dev->of_node, "ae-handle", 0);
-		if (IS_ERR_OR_NULL(ae_node)) {
-			ret = PTR_ERR(ae_node);
+		if (!ae_node) {
+			ret = -ENODEV;
 			dev_err(dev, "not find ae-handle\n");
 			goto out_read_prop_fail;
 		}
-- 
1.9.1

Re: net: hns: set correct return value

[Tobias Klauser]

On 2017-10-29 at 15:35:32 +0100, Pan Bian <bianpan2016@163.com> wrote:
> The function of_parse_phandle() returns a NULL pointer if it cannot
> resolve a phandle property to a device_node pointer. In function
> hns_nic_dev_probe(), its return value is passed to PTR_ERR to extract
> the error code. However, in this case, the extracted error code will
> always be zero, which is unexpected.
> 
> Signed-off-by: Pan Bian <bianpan2016@163.com>

The subject is missing a [PATCH] prefix which causes the patch e.g. to
not show up on patchwork [1]. Care to resend with the proper subject?

[1] https://patchwork.ozlabs.org/project/netdev/list/

Care to resend with the proper subject?

For the patch itself:

Reviewed-by: Tobias Klauser <tklauser@distanz.ch>