Messages in this thread Patch in this message | | | From | Harini Katakam <> | Subject | [PATCH] net: macb: Add null check for PCLK and HCLK | Date | Wed, 20 Mar 2019 19:12:22 +0530 |
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Both PCLK and HCLK are "required" clocks according to macb devicetree documentation. There is a chance that devm_clk_get doesn't return a negative error but just a NULL clock structure instead. In such a case the driver proceeds as usual and uses pclk value 0 to calculate MDC divisor which is incorrect. Hence fix the same in clock initialization.
Signed-off-by: Harini Katakam <harini.katakam@xilinx.com> --- Changes from RFC: Use IS_ERR_OR_NULL Add error for NULL condition
drivers/net/ethernet/cadence/macb_main.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 98c2352..a44171f 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -3370,14 +3370,20 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk, *hclk = devm_clk_get(&pdev->dev, "hclk"); } - if (IS_ERR(*pclk)) { + if (IS_ERR_OR_NULL(*pclk)) { err = PTR_ERR(*pclk); + if (!err) + err = -ENODEV; + dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err); return err; } - if (IS_ERR(*hclk)) { + if (IS_ERR_OR_NULL(*hclk)) { err = PTR_ERR(*hclk); + if (!err) + err = -ENODEV; + dev_err(&pdev->dev, "failed to get hclk (%u)\n", err); return err; } -- 2.7.4
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