Re: imx8mm board crash in drivers/usb/chipidea/ci_hdrc_imx.c

[Frieder Schrempf]

On 21.09.21 08:42, Frieder Schrempf wrote:
> Hi Fabio,
> 
> On 20.09.21 22:50, Fabio Estevam wrote:
>> Hi Frieder,
>>
>> On Mon, Sep 20, 2021 at 11:26 AM Frieder Schrempf
>> <frieder.schrempf@xxxxxxxxxx> wrote:
>>
>>> Commit ed5a419bb019 ("usb: chipidea: imx: "fsl,usbphy" phandle is not
>>> mandatory now") explains, that the core driver already covers reading
>>> the "phys" property (see ci_hdrc_probe()):
>>>
>>>   Since the chipidea common code support get the USB PHY phandle from
>>>   "phys", the glue layer is not mandatory to get the "fsl,usbphy"
>>>   phandle any more.
>>>
>>> This seems to be the reason why ci_hdrc_imx_probe() doesn't return any
>>> error in case "fsl,usbphy" is not set. It expects that the core will
>>> handle data->phy = NULL and already checks for a "phys" property.
>>
>> chipidea core populates ci->usb_phy when phys is used.
>>
>> The charger detection function only checks data->usb_phy, so they
>> don't see ci->usb_phy that was populated by the chipidea core.
>>
>> We could change the signature of all charger detection functions to
>> receive struct ci_hdrc *ci, but that will be a huge patch that will
>> probably not meet
>> the stable requirements, so I think to minimally fix stable we should
>> go with the proposed fix I suggested.
> 
> Ok, thanks for the explanation. I agree. Would you mind sending the fix
> as formal patch?

Sorry, I just saw you already did.