On DT systems the driver require a clock, but the probe just print a
warning and continue, leading to a crash when resetting the device.
To fix this crash and properly handle probe deferals only ignore the
missing clock if DT isn't used or if the clock doesn't exist.

Signed-off-by: Alban Bedel <redacted>
---
 drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index d0d0d12b531f..68b48edc5921 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c

@@ -1756,6 +1756,12 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)

        pdata->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(pdata->clk)) {
+               /* Abort if the clock is defined but couldn't be retrived.
+                * Always abort if the clock is missing on DT system as
+                * the driver can't cope with this case.
+                */
+               if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
+                       return PTR_ERR(pdata->clk);
                /* Firmware may have set up the clock already. */
                dev_info(dev, "clocks have been setup already\n");
        }
--

2.11.0