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

[Martin Blumenstingl]

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)

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?

>>       }
>>
>>       return ret;
>
>


Regards
Martin