PCI: armada8x: Propagate errors for optional PHYs

devm_of_phy_get_by_index() 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 devres structures. Propagating only
-EPROBE_DEFER is problematic because it results in these legitimately
fatal errors being treated as "PHY not specified in DT".

What we really want is to ignore the optional PHYs only if they have not
been specified in DT. devm_of_phy_get_by_index() 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: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
index 3d55dc78d999ce9395c3baba4a788dae51fb6fb6..49596547e8c297d056fb49d12e0e1cce011760ba 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-armada8k.c
+++ b/drivers/pci/controller/dwc/pcie-armada8k.c
@@ -118,11 +118,10 @@ static int armada8k_pcie_setup_phys(struct armada8k_pcie *pcie)
 
        for (i = 0; i < ARMADA8K_PCIE_MAX_LANES; i++) {
                pcie->phy[i] = devm_of_phy_get_by_index(dev, node, i);
-               if (IS_ERR(pcie->phy[i]) &&
-                   (PTR_ERR(pcie->phy[i]) == -EPROBE_DEFER))
-                       return PTR_ERR(pcie->phy[i]);
-
                if (IS_ERR(pcie->phy[i])) {
+                       if (PTR_ERR(pcie->phy[i]) != -ENODEV)
+                               return PTR_ERR(pcie->phy[i]);
+
                        pcie->phy[i] = NULL;
                        continue;
                }