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PCI: histb: Propagate errors for optional regulators 

regulator_get_optional() can fail for a number of reasons besides probe
deferral. It can for example return -ENOMEM if it runs out of memory as
it tries to allocate data structures. Propagating only -EPROBE_DEFER is
problematic because it results in these legitimately fatal errors being
treated as "regulator not specified in DT".

What we really want is to ignore the optional regulators only if they
have not been specified in DT. regulator_get_optional() returns -ENODEV
in this case, so that's the special case that we need to handle. So we
propagate all errors, except -ENODEV, so that real failures will still
cause the driver to fail probe.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Thierry Reding 2019-08-29 12:53:18 +02:00 committed by Lorenzo Pieralisi
parent e7a877b2fa
commit 8f9e1641ba
1 changed files with 2 additions and 2 deletions
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4
drivers/pci/controller/dwc/pcie-histb.c
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@ -340,8 +340,8 @@ static int histb_pcie_probe(struct platform_device *pdev)
hipcie->vpcie = devm_regulator_get_optional(dev, "vpcie");
if (IS_ERR(hipcie->vpcie)) {
if (PTR_ERR(hipcie->vpcie) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (PTR_ERR(hipcie->vpcie) != -ENODEV)
return PTR_ERR(hipcie->vpcie);
hipcie->vpcie = NULL;
}