On Fri, Apr 12, 2013 at 09:34:13AM -0600, Stephen Warren wrote: > On 04/12/2013 08:58 AM, Jay Agarwal wrote: > >>> err = regulator_disable(pcie->pex_clk_supply); > >>> if (err < 0) > >>> - dev_err(pcie->dev, "failed to disable pex-clk regulator: > >> %d\n", > >>> + dev_warn(pcie->dev, "failed to disable pex-clk regulator: > >> %d\n", > >>> err); > >>> > >>> err = regulator_disable(pcie->vdd_supply); > >>> if (err < 0) > >>> - dev_err(pcie->dev, "failed to disable VDD regulator: %d\n", > >>> + dev_warn(pcie->dev, "failed to disable VDD regulator: > >> %d\n", > >>> err); > >> > >> Please explain why that change is correct. If the regulators only exist on > >> Tegra20, please represent that fact in the SoC data. Regulators must always > >> exist, so enable/disable should never fail due to missing regulators. > >> Actual > >> run-time failures seem like something that really is an error. > >> > > [>] These regulators are needed for both tegra20 & tegra30. Since we are > > not returning error here, so changed to dev_warn. > > If the regulators are required, then any failure to operate them should > be an error, hence dev_err() seems correct. > > As to why the code doesn't actually return an error? I'm not sure. > Perhaps that should be fixed with a separate patch, although I don't > recall exactly where in the code the above excerpt is; if it's in > remove(), then continuing on without returning an error would be > appropriate.
That code is from tegra_pcie_power_off(), which is called only during error cleanup or from tegra_pcie_put_resources() which in turn is also only called in cleanup paths or during module/device removal. Disabling as many regulators as possible is still what we want in that case, so returning an error prematurely might leave more regulators turned on than necessary. Thierry
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