From: Thierry Reding treding@nvidia.com
[ Upstream commit 2170a09fb4b0f66e06e5bcdcbc98c9ccbf353650 ]
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: Richard Zhu hongxing.zhu@nxp.com Cc: Lucas Stach l.stach@pengutronix.de Cc: Shawn Guo shawnguo@kernel.org Cc: Sascha Hauer s.hauer@pengutronix.de Cc: Fabio Estevam festevam@gmail.com Cc: kernel@pengutronix.de Cc: linux-imx@nxp.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pci-imx6.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 3826b444298c1..3b2ceb5667289 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -807,8 +807,8 @@ static int imx6_pcie_probe(struct platform_device *pdev)
imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie"); if (IS_ERR(imx6_pcie->vpcie)) { - if (PTR_ERR(imx6_pcie->vpcie) == -EPROBE_DEFER) - return -EPROBE_DEFER; + if (PTR_ERR(imx6_pcie->vpcie) != -ENODEV) + return PTR_ERR(imx6_pcie->vpcie); imx6_pcie->vpcie = NULL; }