On Fri, Mar 11, 2016 at 12:38:23PM -0600, Bjorn Helgaas wrote:
> On Mon, Mar 07, 2016 at 12:32:21PM +0800, Shawn Lin wrote:
> > If the return value of devm_phy_get is EPROBE_DEFER, we should
> > defer probing the driver.
> >
> > Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>
> Applied to pci/host-keystone for v4.6 with the following changelog.
> Thanks, Shawn!
>
> PCI: keystone: Defer probing if devm_phy_get() returns -EPROBE_DEFER
>
> A SerDes PHY is optional, so if devm_phy_get() doesn't find one at all,
> that's fine. But if devm_phy_get() finds a PHY that doesn't have a driver
> yet, it returns -EPROBE_DEFER. In that case, defer probing the Keystone
> driver. We may be able to load it later after a PHY driver is loaded.
>
> [bhelgaas: changelog]
> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
I meant to include the patch, too, because I tweaked it slightly to
try to make it easier to read. Here's what I applied:
diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c
index 0aa81bd..cd70345 100644
--- a/drivers/pci/host/pci-keystone.c
+++ b/drivers/pci/host/pci-keystone.c
@@ -359,6 +359,9 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
/* initialize SerDes Phy if present */
phy = devm_phy_get(dev, "pcie-phy");
+ if (PTR_ERR_OR_ZERO(phy) == -EPROBE_DEFER)
+ return PTR_ERR(phy);
+
if (!IS_ERR_OR_NULL(phy)) {
ret = phy_init(phy);
if (ret < 0)
>
> > ---
> >
> > drivers/pci/host/pci-keystone.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c
> > index 0aa81bd..42af6ac 100644
> > --- a/drivers/pci/host/pci-keystone.c
> > +++ b/drivers/pci/host/pci-keystone.c
> > @@ -363,6 +363,8 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
> > ret = phy_init(phy);
> > if (ret < 0)
> > return ret;
> > + } else if (PTR_ERR(phy) == -EPROBE_DEFER) {
> > + return PTR_ERR(phy);
> > }
> >
> > /* index 2 is to read PCI DEVICE_ID */
> > --
> > 2.3.7
> >
> >
> > --
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