Hello Chunfeng,
thank you for the patch!
On Fri, Jun 22, 2018 at 8:33 AM Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> wrote:
>
> 1. use IS_ERR() but not IS_ERR_OR_NULL() because devm_of_phy_get_by_index()
> never return NULL value;
ACK - good catch!
> 2. devm_of_phy_get_by_index() should not fail for a valid index
I have learned that the PHY framework can return -ENODEV if the PHY is:
1. supposed to be handled by the legacy USB PHY framework
2. the PHY node is disabled in devicetree
see [0] for the code in the PHY framework and [1] for the discussion
with Johan (who informed me of case #1, I added him on this mail)
> Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> ---
> drivers/usb/core/phy.c | 11 ++++-------
> 1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
> index 9879767..0f972e1 100644
> --- a/drivers/usb/core/phy.c
> +++ b/drivers/usb/core/phy.c
> @@ -23,14 +23,11 @@ static int usb_phy_roothub_add_phy(struct device *dev, int index,
> struct list_head *list)
> {
> struct usb_phy_roothub *roothub_entry;
> - struct phy *phy = devm_of_phy_get_by_index(dev, dev->of_node, index);
> + struct phy *phy;
>
> - if (IS_ERR_OR_NULL(phy)) {
> - if (!phy || PTR_ERR(phy) == -ENODEV)
> - return 0;
> - else
> - return PTR_ERR(phy);
> - }
> + phy = devm_of_phy_get_by_index(dev, dev->of_node, index);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
@Johan can you please review this as well? maybe we need to keep the
-ENODEV check
Regards
Martin
[0] https://elixir.bootlin.com/linux/v4.18-rc2/source/drivers/phy/phy-core.c#L421
[1] https://lkml.org/lkml/2018/4/19/88
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