From 9aea7779b764a11e357d3c74af6aee3cf90f2045 Mon Sep 17 00:00:00 2001 From: Alban Bedel Date: Tue, 28 Feb 2017 18:08:55 +0100 Subject: [PATCH] drivers: net: xgene: Fix crash on DT systems 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 Acked-by: Iyappan Subramanian Signed-off-by: David S. Miller --- 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 e536301acfde..b3568c453b14 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -1749,6 +1749,12 @@ 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"); } -- 2.20.1