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net: stmmac: Balance PTP reference clock enable/disable

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clk_prepare_enable() and clk_disable_unprepare() for this clock aren't
properly balanced, which can trigger a WARN_ON() in the common clock
framework.

Reviewed-By: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thierry Reding 2017-03-10 17:34:56 +01:00 committed by David S. Miller
parent c66f6c3775
commit 0ad2be79f2
2 changed files with 4 additions and 1 deletions
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4
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -1711,6 +1711,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
stmmac_mmc_setup(priv);
if (init_ptp) {
ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
if (ret < 0)
netdev_warn(priv->dev, "failed to enable PTP reference clock: %d\n", ret);
ret = stmmac_init_ptp(priv);
if (ret == -EOPNOTSUPP)
netdev_warn(priv->dev, "PTP not supported by HW\n");

1
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
View File

@ -365,7 +365,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
plat->clk_ptp_ref = NULL;
dev_warn(&pdev->dev, "PTP uses main clock\n");
} else {
clk_prepare_enable(plat->clk_ptp_ref);
plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
}