[PATCH usb-next v1] usb: core: phy: fix return value of usb_phy_roothub_exit()

[Chunfeng Yun]

Hi,
On Mon, 2018-03-26 at 22:12 +0200, Martin Blumenstingl wrote:
> Hi Chunfeng,
> 
> On Mon, Mar 26, 2018 at 5:43 AM, Chunfeng Yun <chunfeng.yun at mediatek.com> wrote:
> > On Sat, 2018-03-24 at 14:56 +0100, Martin Blumenstingl wrote:
> >> usb_phy_roothub_exit() should return the error code from the phy_exit()
> >> call if exiting the PHY failed.
> >> However, since a wrong variable is used usb_phy_roothub_exit() currently
> >> always returns 0, even if one of the phy_exit calls returned an error.
> >> Fix this by assigning the error code from phy_exit() to the "ret"
> >> variable to propagate the error correctly.
> >>
> >> Fixes: 07dbff0ddbd86c ("usb: core: add a wrapper for the USB PHYs on the HCD")
> >> Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
> >> ---
> >>  drivers/usb/core/phy.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
> >> index 09b7c43c0ea4..f19aaa3c899c 100644
> >> --- a/drivers/usb/core/phy.c
> >> +++ b/drivers/usb/core/phy.c
> >> @@ -111,7 +111,7 @@ int usb_phy_roothub_exit(struct usb_phy_roothub *phy_roothub)
> >>       list_for_each_entry(roothub_entry, head, list) {
> >>               err = phy_exit(roothub_entry->phy);
> >>               if (err)
> >> -                     ret = ret;
> >> +                     ret = err;
> > Need break the loop?
> in the original implementation I decided not to break the loop here so
> phy_exit is called for all PHYs -> only the problematic ones will
> remain initialized
> (in the _power_on implementation we can try to fix the state by adding
> a break and then calling _power_off for all PHYs before the "broken"
> one where _power_on failed)
> 
got it
> also if phy_exit fails then something is probably very wrong
> 
> do you have any specific use-case in mind where the missing break
> could be a problem?
No
> 
> >>       }
> >>
> >>       return ret;
> >
> >
> 
> 
> Regards
> Martin