On Friday, July 29, 2016 5:33:54 PM CEST Iyappan Subramanian wrote:
> This patch fixes the following kbuild warning, when ACPI was not enabled.
>
> >> drivers/net/ethernet/apm/xgene/xgene_enet_hw.c:878:23: warning: 'phy_dev' may be used uninitialized in this function [-Wmaybe-uninitialized]
> phy_dev->advertising = phy_dev->supported;
>From looking at the patch, I don't think it addresses the warning.
Note that Linus added a patch to disable the warning in the latest
mainline kernel, so you won't see it any more, but I think the bug
is still there.
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> index 7714b7d..b6bc6fa 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> @@ -776,15 +776,11 @@ int xgene_enet_phy_connect(struct net_device *ndev)
> netdev_err(ndev, "Could not connect to PHY\n");
> return -ENODEV;
> }
> -
> - pdata->phy_dev = phy_dev;
> } else {
> #ifdef CONFIG_ACPI
> struct acpi_device *adev = acpi_phy_find_device(dev);
> if (adev)
> - pdata->phy_dev = adev->driver_data;
> -
> - phy_dev = pdata->phy_dev;
> + phy_dev = adev->driver_data;
>
> if (!phy_dev ||
> phy_connect_direct(ndev, phy_dev, &xgene_enet_adjust_link,
> @@ -795,6 +791,7 @@ int xgene_enet_phy_connect(struct net_device *ndev)
> #endif
> }
>
> + pdata->phy_dev = phy_dev;
phy_dev is not initialized anywhere if CONFIG_ACPI is not set
and dev->of_node is NULL (which should not happen in practice,
but the compiler doesn't know that).
I think you want this instead:
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
index 7714b7d4026a..98779fe2d558 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
@@ -792,6 +792,8 @@ int xgene_enet_phy_connect(struct net_device *ndev)
netdev_err(ndev, "Could not connect to PHY\n");
return -ENODEV;
}
+#else
+ return -ENODEV;
#endif
}
ARnd
Arnd
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