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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 <alban.bedel@avionic-design.de>
Acked-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alban Bedel 2017-02-28 18:08:55 +01:00 committed by David S. Miller
parent e3330039ea
commit 9aea7779b7
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/apm/xgene/xgene_enet_main.c
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@ -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");
}